Merge branch 'master' of https://github.com/Citadel-Station-13/Citadel-Station-13 into stop-lag

code/game/area/Space_Station_13_areas.dm

@@ -1245,6 +1245,22 @@ NOTE: there are two lists of areas in the end of this file: centcom and station
 	icon_state = "storage_wing"
 
 
+// Vacant Rooms
+
+/area/vacant_room
+	name = "Vacant Room"
+	ambientsounds = MAINTENANCE
+	icon_state = "vacant_room"
+
+/area/vacant_room/office
+	name = "Vacant Office"
+	icon_state = "vacant_room"
+
+/area/vacant_room/commissary
+	name = "Vacant Commissary"
+	icon_state = "vacant_room"
+
+
 //AI
 
 /area/ai_monitored/security/armory
@@ -1367,3 +1383,7 @@ NOTE: there are two lists of areas in the end of this file: centcom and station
 /area/tcommsat/lounge
 	name = "Telecommunications Satellite Lounge"
 	icon_state = "tcomsatlounge"
+
+/area/crew_quarters/fitness/pool
+	name = "Pool Area"
+	icon_state = "pool"

code/game/atoms.dm

@@ -38,6 +38,13 @@
 	var/rad_flags = NONE // Will move to flags_1 when i can be arsed to
 	var/rad_insulation = RAD_NO_INSULATION
 
+	///The custom materials this atom is made of, used by a lot of things like furniture, walls, and floors (if I finish the functionality, that is.)
+	var/list/custom_materials
+	///Bitfield for how the atom handles materials.
+	var/material_flags = NONE
+	///Modifier that raises/lowers the effect of the amount of a material, prevents small and easy to get items from being death machines.
+	var/material_modifier = 1
+
 	var/icon/blood_splatter_icon
 	var/list/fingerprints
 	var/list/fingerprintshidden
@@ -89,6 +96,12 @@
 	if (canSmoothWith)
 		canSmoothWith = typelist("canSmoothWith", canSmoothWith)
 
+	var/temp_list = list()
+	for(var/i in custom_materials)
+		temp_list[getmaterialref(i)] = custom_materials[i] //Get the proper instanced version
+	custom_materials = null //Null the list to prepare for applying the materials properly
+	set_custom_materials(temp_list)
+
 	ComponentInitialize()
 
 	return INITIALIZE_HINT_NORMAL
@@ -290,6 +303,11 @@
 	if(desc)
 		. += desc
 
+	if(custom_materials)
+		for(var/i in custom_materials)
+			var/datum/material/M = i
+			. += "<u>It is made out of [M.name]</u>."
+
 	if(reagents)
 		if(reagents.reagents_holder_flags & TRANSPARENT)
 			. += "It contains:"
@@ -316,9 +334,11 @@
 /atom/proc/update_icon()
 	// I expect we're going to need more return flags and options in this proc
 	var/signalOut = SEND_SIGNAL(src, COMSIG_ATOM_UPDATE_ICON)
+	. = FALSE
 
 	if(!(signalOut & COMSIG_ATOM_NO_UPDATE_ICON_STATE))
 		update_icon_state()
+		. = TRUE
 
 	if(!(signalOut & COMSIG_ATOM_NO_UPDATE_OVERLAYS))
 		var/list/new_overlays = update_overlays()
@@ -328,6 +348,9 @@
 		if(length(new_overlays))
 			managed_overlays = new_overlays
 			add_overlay(new_overlays)
+		. = TRUE
+
+	SEND_SIGNAL(src, COMSIG_ATOM_UPDATED_ICON, signalOut, .)
 
 /// Updates the icon state of the atom
 /atom/proc/update_icon_state()
@@ -872,3 +895,26 @@ Proc for attack log creation, because really why not
 
 /atom/proc/intercept_zImpact(atom/movable/AM, levels = 1)
 	. |= SEND_SIGNAL(src, COMSIG_ATOM_INTERCEPT_Z_FALL, AM, levels)
+
+///Sets the custom materials for an item.
+/atom/proc/set_custom_materials(var/list/materials, multiplier = 1)
+
+	if(!materials)
+		materials = custom_materials
+
+	if(custom_materials) //Only runs if custom materials existed at first. Should usually be the case but check anyways
+		for(var/i in custom_materials)
+			var/datum/material/custom_material = getmaterialref(i)
+			custom_material.on_removed(src, material_flags) //Remove the current materials
+
+	if(!length(materials))
+		return
+
+	custom_materials = list() //Reset the list
+
+	for(var/x in materials)
+		var/datum/material/custom_material = getmaterialref(x)
+
+		if(!(material_flags & MATERIAL_NO_EFFECTS))
+			custom_material.on_applied(src, materials[custom_material] * multiplier * material_modifier, material_flags)
+		custom_materials[custom_material] += materials[x] * multiplier

code/game/gamemodes/clown_ops/bananium_bomb.dm

@@ -4,23 +4,17 @@
 	icon = 'icons/obj/machines/nuke.dmi'
 	icon_state = "bananiumbomb_base"
 
-/obj/machinery/nuclearbomb/syndicate/bananium/update_icon()
-	if(deconstruction_state == NUKESTATE_INTACT)
-		switch(get_nuke_state())
-			if(NUKE_OFF_LOCKED, NUKE_OFF_UNLOCKED)
-				icon_state = "bananiumbomb_base"
-				update_icon_interior()
-				update_icon_lights()
-			if(NUKE_ON_TIMING)
-				cut_overlays()
-				icon_state = "bananiumbomb_timing"
-			if(NUKE_ON_EXPLODING)
-				cut_overlays()
-				icon_state = "bananiumbomb_exploding"
-	else
+/obj/machinery/nuclearbomb/syndicate/bananium/update_icon_state()
+	if(deconstruction_state != NUKESTATE_INTACT)
 		icon_state = "bananiumbomb_base"
-		update_icon_interior()
-		update_icon_lights()
+		return
+	switch(get_nuke_state())
+		if(NUKE_OFF_LOCKED, NUKE_OFF_UNLOCKED)
+			icon_state = "bananiumbomb_base"
+		if(NUKE_ON_TIMING)
+			icon_state = "bananiumbomb_timing"
+		if(NUKE_ON_EXPLODING)
+			icon_state = "bananiumbomb_exploding"
 
 /obj/machinery/nuclearbomb/syndicate/bananium/get_cinematic_type(off_station)
 	switch(off_station)

code/game/gamemodes/clown_ops/clown_weapons.dm

@@ -40,14 +40,14 @@
 /obj/item/clothing/shoes/clown_shoes/banana_shoes/combat/Initialize()
 	. = ..()
 	var/datum/component/material_container/bananium = GetComponent(/datum/component/material_container)
-	bananium.insert_amount(max_recharge, MAT_BANANIUM)
+	bananium.insert_amount_mat(max_recharge, /datum/material/bananium)
 	START_PROCESSING(SSobj, src)
 
 /obj/item/clothing/shoes/clown_shoes/banana_shoes/combat/process()
 	var/datum/component/material_container/bananium = GetComponent(/datum/component/material_container)
-	var/bananium_amount = bananium.amount(MAT_BANANIUM)
+	var/bananium_amount = bananium.get_material_amount(/datum/material/bananium)
 	if(bananium_amount < max_recharge)
-		bananium.insert_amount(min(recharge_rate, max_recharge - bananium_amount), MAT_BANANIUM)
+		bananium.insert_amount_mat(min(recharge_rate, max_recharge - bananium_amount), /datum/material/bananium)
 
 /obj/item/clothing/shoes/clown_shoes/banana_shoes/combat/attack_self(mob/user)
 	ui_action_click(user)

code/game/gamemodes/dynamic/dynamic.dm

@@ -672,7 +672,7 @@ GLOBAL_VAR_INIT(dynamic_storyteller_type, /datum/dynamic_storyteller/classic)
 		// Time to inject some threat into the round
 		if(EMERGENCY_ESCAPED_OR_ENDGAMED) // Unless the shuttle is gone
 			return
-		if((world.realtime - SSshuttle.realtimeofstart) > SSshuttle.auto_call) // no rules after shuttle is auto-called
+		if(SSshuttle.endvote_passed) // no rules after shuttle call is voted
 			return
 		message_admins("DYNAMIC: Checking for midround injection.")
 		log_game("DYNAMIC: Checking for midround injection.")
@@ -748,7 +748,7 @@ GLOBAL_VAR_INIT(dynamic_storyteller_type, /datum/dynamic_storyteller/classic)
 		return
 	if(EMERGENCY_ESCAPED_OR_ENDGAMED) // No more rules after the shuttle has left
 		return
-	if((world.realtime - SSshuttle.realtimeofstart) > SSshuttle.auto_call) // no rules after shuttle is auto-called
+	if(SSshuttle.endvote_passed) // no rules after shuttle is auto-called
 		return
 	update_playercounts()
 

code/game/gamemodes/dynamic/dynamic_storytellers.dm

@@ -57,7 +57,8 @@ Property weights are:
 							mean += 2.5
 						if(CHAOS_MAX)
 							mean += 5
-			GLOB.dynamic_curve_centre += (mean/voters)
+			if(voters)
+				GLOB.dynamic_curve_centre += (mean/voters)
 		GLOB.dynamic_forced_threat_level = forced_threat_level
 
 /datum/dynamic_storyteller/proc/get_midround_cooldown()

code/game/gamemodes/gangs/dominator.dm

@@ -13,7 +13,7 @@
 	anchored = TRUE
 	layer = HIGH_OBJ_LAYER
 	max_integrity = 300
-	integrity_failure = 100
+	integrity_failure = 0.33
 	armor = list("melee" = 20, "bullet" = 50, "laser" = 50, "energy" = 50, "bomb" = 10, "bio" = 100, "rad" = 100, "fire" = 10, "acid" = 70)
 	var/datum/team/gang/gang
 	var/operating = FALSE	//false=standby or broken, true=takeover

code/game/gamemodes/gangs/gang_items.dm

@@ -220,11 +220,11 @@ datum/gang_item/clothing/shades //Addition: Why not have cool shades on a gang m
 	cost = 15
 	item_path = /obj/item/ammo_box/magazine/sniper_rounds
 
-/datum/gang_item/weapon/ammo/sleeper_ammo
+/*/datum/gang_item/weapon/ammo/sleeper_ammo	//no. absolutely no.
 	name = "Illicit Soporific Cartridges"
 	id = "sniper_ammo"
-	cost = 15
-	item_path = /obj/item/ammo_box/magazine/sniper_rounds/soporific
+	cost = 15	//who the fuck thought a ONE-HIT K.O. for 15 gbp IN AN ENVIRONMENT WHERE WE'RE GETTING RID OF HARDSTUNS is a GOOD IDEA
+	item_path = /obj/item/ammo_box/magazine/sniper_rounds/soporific*/
 
 /datum/gang_item/weapon/machinegun
 	name = "Mounted Machine Gun"

code/game/gamemodes/objective.dm

@@ -314,9 +314,11 @@ GLOBAL_LIST_EMPTY(objectives)
 
 /datum/objective/hijack
 	name = "hijack"
-	explanation_text = "Hijack the shuttle to ensure no loyalist Nanotrasen crew escape alive and out of custody."
-	team_explanation_text = "Hijack the shuttle to ensure no loyalist Nanotrasen crew escape alive and out of custody. Leave no team member behind."
+	explanation_text = "Hijack the emergency shuttle by hacking its navigational protocols through the control console (alt click emergency shuttle console)."
+	team_explanation_text = "Hijack the emergency shuttle by hacking its navigational protocols through the control console (alt click emergency shuttle console). Leave no team member behind."
 	martyr_compatible = 0 //Technically you won't get both anyway.
+	/// Overrides the hijack speed of any antagonist datum it is on ONLY, no other datums are impacted.
+	var/hijack_speed_override = 1
 
 /datum/objective/hijack/check_completion() // Requires all owners to escape.
 	if(SSshuttle.emergency.mode != SHUTTLE_ENDGAME)

code/game/gamemodes/objective_sabotage.dm

@@ -36,7 +36,7 @@
 /datum/sabotage_objective/processing/power_sink
 	name = "Drain at least 1 gigajoule of power using a power sink."
 	sabotage_type = "powersink"
-	special_equipment = list(/obj/item/powersink)
+	special_equipment = list(/obj/item/sbeacondrop/powersink)
 	var/sink_found = FALSE
 	var/count = 0
 

code/game/machinery/Beacon.dm

@@ -28,7 +28,7 @@
 	update_icon()
 
 // update the icon_state
-/obj/machinery/bluespace_beacon/update_icon()
+/obj/machinery/bluespace_beacon/update_icon_state()
 	var/state="floor_beacon"
 
 	if(invisibility)

code/game/machinery/PDApainter.dm

@@ -9,16 +9,12 @@
 	var/list/colorlist = list()
 
 
-/obj/machinery/pdapainter/update_icon()
-	cut_overlays()
+/obj/machinery/pdapainter/update_icon_state()
 
 	if(stat & BROKEN)
 		icon_state = "[initial(icon_state)]-broken"
 		return
 
-	if(storedpda)
-		add_overlay("[initial(icon_state)]-closed")
-
 	if(powered())
 		icon_state = initial(icon_state)
 	else
@@ -26,6 +22,15 @@
 
 	return
 
+/obj/machinery/pdapainter/update_overlays()
+	. = ..()
+
+	if(stat & BROKEN)
+		return
+
+	if(storedpda)
+		. += "[initial(icon_state)]-closed"
+
 /obj/machinery/pdapainter/Initialize()
 	. = ..()
 	var/list/blocked = list(

code/game/machinery/Sleeper.dm

@@ -71,7 +71,7 @@
 		reagents.maximum_volume = (500*E)
 
 
-/obj/machinery/sleeper/update_icon()
+/obj/machinery/sleeper/update_icon_state()
 	icon_state = initial(icon_state)
 	if(state_open)
 		icon_state += "-open"

code/game/machinery/airlock_control.dm

@@ -113,7 +113,7 @@
 	id_tag = INCINERATOR_SYNDICATELAVA_AIRLOCK_SENSOR
 	master_tag = INCINERATOR_SYNDICATELAVA_AIRLOCK_CONTROLLER
 
-/obj/machinery/airlock_sensor/update_icon()
+/obj/machinery/airlock_sensor/update_icon_state()
 	if(on)
 		if(alert)
 			icon_state = "airlock_sensor_alert"

code/game/machinery/announcement_system.dm

@@ -29,25 +29,25 @@ GLOBAL_LIST_EMPTY(announcement_systems)
 /obj/machinery/announcement_system/Initialize()
 	. = ..()
 	GLOB.announcement_systems += src
-	radio = new /obj/item/radio/headset/ai(src)
+	radio = new /obj/item/radio/headset/silicon/ai(src)
 	update_icon()
 
-/obj/machinery/announcement_system/update_icon()
+/obj/machinery/announcement_system/update_icon_state()
 	if(is_operational())
 		icon_state = (panel_open ? "AAS_On_Open" : "AAS_On")
 	else
 		icon_state = (panel_open ? "AAS_Off_Open" : "AAS_Off")
 
-
-	cut_overlays()
+/obj/machinery/announcement_system/update_overlays()
+	. =..()
 	if(arrivalToggle)
-		add_overlay(greenlight)
+		. += greenlight
 
 	if(newheadToggle)
-		add_overlay(pinklight)
+		. += pinklight
 
 	if(stat & BROKEN)
-		add_overlay(errorlight)
+		. += errorlight
 
 /obj/machinery/announcement_system/Destroy()
 	QDEL_NULL(radio)

code/game/machinery/aug_manipulator.dm

@@ -19,21 +19,21 @@
 	initial_icon_state = initial(icon_state)
 	return ..()
 
-/obj/machinery/aug_manipulator/update_icon()
-	cut_overlays()
-
+/obj/machinery/aug_manipulator/update_icon_state()
 	if(stat & BROKEN)
 		icon_state = "[initial_icon_state]-broken"
 		return
 
-	if(storedpart)
-		add_overlay("[initial_icon_state]-closed")
-
 	if(powered())
 		icon_state = initial_icon_state
 	else
 		icon_state = "[initial_icon_state]-off"
 
+/obj/machinery/aug_manipulator/update_overlays()
+	. = ..()
+	if(storedpart)
+		. += "[initial_icon_state]-closed"
+
 /obj/machinery/aug_manipulator/Destroy()
 	QDEL_NULL(storedpart)
 	return ..()

code/game/machinery/autolathe.dm

@@ -47,7 +47,23 @@
 							)
 
 /obj/machinery/autolathe/Initialize()
-	AddComponent(/datum/component/material_container, list(MAT_METAL, MAT_GLASS), 0, TRUE, null, null, CALLBACK(src, .proc/AfterMaterialInsert))
+	AddComponent(/datum/component/material_container,
+	list(/datum/material/iron,
+		/datum/material/glass,
+		/datum/material/gold,
+		/datum/material/silver,
+		/datum/material/diamond,
+		/datum/material/uranium,
+		/datum/material/plasma,
+		/datum/material/bluespace,
+		/datum/material/bananium,
+		/datum/material/titanium,
+		/datum/material/runite,
+		/datum/material/plastic,
+		/datum/material/adamantine,
+		/datum/material/mythril
+	),
+	 0, TRUE, null, null, CALLBACK(src, .proc/AfterMaterialInsert))
 	. = ..()
 
 	wires = new /datum/wires/autolathe(src)
@@ -121,15 +137,14 @@
 
 	return ..()
 
-/obj/machinery/autolathe/proc/AfterMaterialInsert(type_inserted, id_inserted, amount_inserted)
-	if(ispath(type_inserted, /obj/item/stack/ore/bluespace_crystal))
+/obj/machinery/autolathe/proc/AfterMaterialInsert(obj/item/item_inserted, id_inserted, amount_inserted)
+	if(istype(item_inserted, /obj/item/stack/ore/bluespace_crystal))
 		use_power(MINERAL_MATERIAL_AMOUNT / 10)
+	else if(item_inserted.custom_materials?.len && item_inserted.custom_materials[getmaterialref(/datum/material/glass)])
+		flick("autolathe_r",src)//plays glass insertion animation by default otherwise
 	else
-		switch(id_inserted)
-			if (MAT_METAL)
-				flick("autolathe_o",src)//plays metal insertion animation
-			if (MAT_GLASS)
-				flick("autolathe_r",src)//plays glass insertion animation
+		flick("autolathe_o",src)//plays metal insertion animation
+
 		use_power(min(1000, amount_inserted / 100))
 	updateUsrDialog()
 
@@ -160,18 +175,42 @@
 			/////////////////
 
 			var/coeff = (is_stack ? 1 : prod_coeff) //stacks are unaffected by production coefficient
-			var/metal_cost = being_built.materials[MAT_METAL]
-			var/glass_cost = being_built.materials[MAT_GLASS]
+			var/total_amount = 0
 
-			var/power = max(2000, (metal_cost+glass_cost)*multiplier/5)
+			for(var/MAT in being_built.materials)
+				total_amount += being_built.materials[MAT]
+
+			var/power = max(2000, (total_amount)*multiplier/5) //Change this to use all materials
 
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			if((materials.amount(MAT_METAL) >= metal_cost*multiplier*coeff) && (materials.amount(MAT_GLASS) >= glass_cost*multiplier*coeff))
+
+			var/list/materials_used = list()
+			var/list/custom_materials = list() //These will apply their material effect, This should usually only be one.
+
+			for(var/MAT in being_built.materials)
+				var/datum/material/used_material = MAT
+				var/amount_needed = being_built.materials[MAT] * coeff * multiplier
+				if(istext(used_material)) //This means its a category
+					var/list/list_to_show = list()
+					for(var/i in SSmaterials.materials_by_category[used_material])
+						if(materials.materials[i] > 0)
+							list_to_show += i
+
+					used_material = input("Choose [used_material]", "Custom Material") as null|anything in list_to_show
+					if(!used_material)
+						return //Didn't pick any material, so you can't build shit either.
+					custom_materials[used_material] += amount_needed
+
+				materials_used[used_material] = amount_needed
+
+			if(materials.has_materials(materials_used))
 				busy = TRUE
 				use_power(power)
 				icon_state = "autolathe_n"
 				var/time = is_stack ? 32 : 32*coeff*multiplier
-				addtimer(CALLBACK(src, .proc/make_item, power, metal_cost, glass_cost, multiplier, coeff, is_stack), time)
+				addtimer(CALLBACK(src, .proc/make_item, power, materials_used, custom_materials, multiplier, coeff, is_stack), time)
+			else
+				to_chat(usr, "<span class=\"alert\">Not enough materials for this operation.</span>")
 
 		if(href_list["search"])
 			matching_designs.Cut()
@@ -188,12 +227,11 @@
 
 	return
 
-/obj/machinery/autolathe/proc/make_item(power, metal_cost, glass_cost, multiplier, coeff, is_stack)
+/obj/machinery/autolathe/proc/make_item(power, var/list/materials_used, var/list/picked_materials, multiplier, coeff, is_stack)
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 	var/atom/A = drop_location()
 	use_power(power)
-	var/list/materials_used = list(MAT_METAL=metal_cost*coeff*multiplier, MAT_GLASS=glass_cost*coeff*multiplier)
-	materials.use_amount(materials_used)
+	materials.use_materials(materials_used)
 
 	if(is_stack)
 		var/obj/item/stack/N = new being_built.build_path(A, multiplier)
@@ -202,10 +240,11 @@
 	else
 		for(var/i=1, i<=multiplier, i++)
 			var/obj/item/new_item = new being_built.build_path(A)
-			new_item.materials = new_item.materials.Copy()
-			for(var/mat in materials_used)
-				new_item.materials[mat] = materials_used[mat] / multiplier
 			new_item.autolathe_crafted(src)
+
+			if(length(picked_materials))
+				new_item.set_custom_materials(picked_materials, 1 / multiplier) //Ensure we get the non multiplied amount
+
 	icon_state = "autolathe"
 	busy = FALSE
 	updateDialog()
@@ -270,7 +309,9 @@
 
 		if(ispath(D.build_path, /obj/item/stack))
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			var/max_multiplier = min(D.maxstack, D.materials[MAT_METAL] ?round(materials.amount(MAT_METAL)/D.materials[MAT_METAL]):INFINITY,D.materials[MAT_GLASS]?round(materials.amount(MAT_GLASS)/D.materials[MAT_GLASS]):INFINITY)
+			var/max_multiplier
+			for(var/datum/material/mat in D.materials)
+				max_multiplier = min(D.maxstack, round(materials.get_material_amount(mat)/D.materials[mat]))
 			if (max_multiplier>10 && !disabled)
 				dat += " <a href='?src=[REF(src)];make=[D.id];multiplier=10'>x10</a>"
 			if (max_multiplier>25 && !disabled)
@@ -302,7 +343,9 @@
 
 		if(ispath(D.build_path, /obj/item/stack))
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			var/max_multiplier = min(D.maxstack, D.materials[MAT_METAL] ?round(materials.amount(MAT_METAL)/D.materials[MAT_METAL]):INFINITY,D.materials[MAT_GLASS]?round(materials.amount(MAT_GLASS)/D.materials[MAT_GLASS]):INFINITY)
+			var/max_multiplier
+			for(var/datum/material/mat in D.materials)
+				max_multiplier = min(D.maxstack, round(materials.get_material_amount(mat)/D.materials[mat]))
 			if (max_multiplier>10 && !disabled)
 				dat += " <a href='?src=[REF(src)];make=[D.id];multiplier=10'>x10</a>"
 			if (max_multiplier>25 && !disabled)
@@ -319,8 +362,10 @@
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 	var/dat = "<b>Total amount:</b> [materials.total_amount] / [materials.max_amount] cm<sup>3</sup><br>"
 	for(var/mat_id in materials.materials)
-		var/datum/material/M = materials.materials[mat_id]
-		dat += "<b>[M.name] amount:</b> [M.amount] cm<sup>3</sup><br>"
+		var/datum/material/M = mat_id
+		var/mineral_amount = materials.materials[mat_id]
+		if(mineral_amount > 0)
+			dat += "<b>[M.name] amount:</b> [mineral_amount] cm<sup>3</sup><br>"
 	return dat
 
 /obj/machinery/autolathe/proc/can_build(datum/design/D, amount = 1)
@@ -329,20 +374,24 @@
 
 	var/coeff = (ispath(D.build_path, /obj/item/stack) ? 1 : prod_coeff)
 
+	var/list/required_materials = list()
+
+	for(var/i in D.materials)
+		required_materials[i] = D.materials[i] * coeff * amount
+
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-	if(D.materials[MAT_METAL] && (materials.amount(MAT_METAL) < (D.materials[MAT_METAL] * coeff * amount)))
-		return FALSE
-	if(D.materials[MAT_GLASS] && (materials.amount(MAT_GLASS) < (D.materials[MAT_GLASS] * coeff * amount)))
-		return FALSE
-	return TRUE
+
+	return materials.has_materials(required_materials)
 
 /obj/machinery/autolathe/proc/get_design_cost(datum/design/D)
 	var/coeff = (ispath(D.build_path, /obj/item/stack) ? 1 : prod_coeff)
 	var/dat
-	if(D.materials[MAT_METAL])
-		dat += "[D.materials[MAT_METAL] * coeff] metal "
-	if(D.materials[MAT_GLASS])
-		dat += "[D.materials[MAT_GLASS] * coeff] glass"
+	for(var/i in D.materials)
+		if(istext(i)) //Category handling
+			dat += "[D.materials[i] * coeff] [i]"
+		else
+			var/datum/material/M = i
+			dat += "[D.materials[i] * coeff] [M.name] "
 	return dat
 
 /obj/machinery/autolathe/proc/reset(wire)

code/game/machinery/bloodbankgen.dm

@@ -54,16 +54,17 @@
 	efficiency = E
 	productivity = P
 
-/obj/machinery/bloodbankgen/update_icon()
-	cut_overlays()
+/obj/machinery/bloodbankgen/update_icon_state()
 	if(is_operational())
-		icon_state = "bloodbank-on"
+		icon_state = "bloodbank-[is_operational() ? "on" : "off"]"
 
+/obj/machinery/bloodbankgen/update_overlays()
+	. = ..()
 	if(panel_open)
-		add_overlay("bloodbank-panel")
+		. += "bloodbank-panel"
 
-	if(src.bag)
-		add_overlay("bloodbag-input")
+	if(bag)
+		. += "bloodbag-input"
 		if(bag.reagents.total_volume)
 			var/mutable_appearance/filling_overlay = mutable_appearance(icon, "input-reagent")
 
@@ -85,10 +86,10 @@
 					filling_overlay.icon_state = "input-reagent100"
 
 			filling_overlay.color = list(mix_color_from_reagents(bag.reagents.reagent_list))
-			add_overlay(filling_overlay)
+			. += filling_overlay
 
-	if(src.outbag)
-		add_overlay("bloodbag-output")
+	if(outbag)
+		. += "bloodbag-output"
 		if(outbag.reagents.total_volume)
 			var/mutable_appearance/filling_overlay = mutable_appearance(icon, "output-reagent")
 
@@ -110,8 +111,7 @@
 					filling_overlay.icon_state = "output-reagent100"
 
 			filling_overlay.color = list(mix_color_from_reagents(outbag.reagents.reagent_list))
-			add_overlay(filling_overlay)
-	return
+			. += filling_overlay
 
 /obj/machinery/bloodbankgen/process()
 	if(!is_operational())

code/game/machinery/buttons.dm

@@ -265,4 +265,4 @@
 	desc = "Used for building buttons."
 	icon_state = "button"
 	result_path = /obj/machinery/button
-	materials = list(MAT_METAL=MINERAL_MATERIAL_AMOUNT)
+	custom_materials = list(/datum/material/iron = MINERAL_MATERIAL_AMOUNT)

code/game/machinery/camera/camera.dm

@@ -17,7 +17,7 @@
 
 	armor = list("melee" = 50, "bullet" = 20, "laser" = 20, "energy" = 20, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 90, "acid" = 50)
 	max_integrity = 100
-	integrity_failure = 50
+	integrity_failure = 0.5
 	var/list/network = list("ss13")
 	var/c_tag = null
 	var/status = TRUE

code/game/machinery/camera/camera_assembly.dm

@@ -3,7 +3,7 @@
 	desc = "The basic construction for Nanotrasen-Always-Watching-You cameras."
 	icon = 'icons/obj/machines/camera.dmi'
 	icon_state = "cameracase"
-	materials = list(MAT_METAL=400, MAT_GLASS=250)
+	custom_materials = list(/datum/material/iron=400, /datum/material/glass=250)
 	result_path = /obj/structure/camera_assembly
 
 

code/game/machinery/cell_charger.dm

@@ -10,18 +10,19 @@
 	circuit = /obj/item/circuitboard/machine/cell_charger
 	pass_flags = PASSTABLE
 	var/obj/item/stock_parts/cell/charging = null
-	var/chargelevel = -1
 	var/charge_rate = 500
 
-/obj/machinery/cell_charger/update_icon()
-	cut_overlays()
-	if(charging)
-		add_overlay(image(charging.icon, charging.icon_state))
-		add_overlay("ccharger-on")
-		if(!(stat & (BROKEN|NOPOWER)))
-			var/newlevel = 	round(charging.percent() * 4 / 100)
-			chargelevel = newlevel
-			add_overlay("ccharger-o[newlevel]")
+/obj/machinery/cell_charger/update_overlays()
+	. += ..()
+
+	if(!charging)
+		return
+
+	. += image(charging.icon, charging.icon_state)
+	. += "ccharger-on"
+	if(!(stat & (BROKEN|NOPOWER)))
+		var/newlevel = round(charging.percent() * 4 / 100)
+		. += "ccharger-o[newlevel]"
 
 /obj/machinery/cell_charger/examine(mob/user)
 	. = ..()
@@ -54,7 +55,6 @@
 
 			charging = W
 			user.visible_message("[user] inserts a cell into [src].", "<span class='notice'>You insert a cell into [src].</span>")
-			chargelevel = -1
 			update_icon()
 	else
 		if(!charging && default_deconstruction_screwdriver(user, icon_state, icon_state, W))
@@ -77,7 +77,6 @@
 /obj/machinery/cell_charger/proc/removecell()
 	charging.update_icon()
 	charging = null
-	chargelevel = -1
 	update_icon()
 
 /obj/machinery/cell_charger/attack_hand(mob/user)

code/game/machinery/cloning.dm

@@ -477,24 +477,30 @@
 
 	flesh_number = unattached_flesh.len
 
-/obj/machinery/clonepod/update_icon()
-	cut_overlays()
-
+/obj/machinery/clonepod/update_icon_state()
 	if(mess)
 		icon_state = "pod_g"
+	else if(occupant)
+		icon_state = "pod_1"
+	else
+		icon_state = "pod_0"
+
+	if(panel_open)
+		icon_state = "pod_0_maintenance"
+
+/obj/machinery/clonepod/update_overlays()
+	. = ..()
+	if(mess)
 		var/image/gib1 = image(CRYOMOBS, "gibup")
 		var/image/gib2 = image(CRYOMOBS, "gibdown")
 		gib1.pixel_y = 27 + round(sin(world.time) * 3)
 		gib1.pixel_x = round(sin(world.time * 3))
 		gib2.pixel_y = 27 + round(cos(world.time) * 3)
 		gib2.pixel_x = round(cos(world.time * 3))
-		add_overlay(gib2)
-		add_overlay(gib1)
-		add_overlay("cover-on")
-
+		. += gib2
+		. += gib1
+		. += "cover-on"
 	else if(occupant)
-		icon_state = "pod_1"
-
 		var/image/occupant_overlay
 		var/completion = (flesh_number - unattached_flesh.len) / flesh_number
 
@@ -513,15 +519,9 @@
 		occupant_overlay.pixel_y = 27 + round(sin(world.time) * 3)
 		occupant_overlay.pixel_x = round(sin(world.time * 3))
 
-		add_overlay(occupant_overlay)
-		add_overlay("cover-on")
-	else
-		icon_state = "pod_0"
-
-	if(panel_open)
-		icon_state = "pod_0_maintenance"
-
-	add_overlay("panel")
+		. += occupant_overlay
+		. += "cover-on"
+	. += "panel"
 
 /*
  *	Manual -- A big ol' manual.

code/game/machinery/computer/_computer.dm

@@ -7,7 +7,7 @@
 	idle_power_usage = 300
 	active_power_usage = 300
 	max_integrity = 200
-	integrity_failure = 100
+	integrity_failure = 0.5
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 40, "acid" = 20)
 	var/brightness_on = 1
 	var/icon_keyboard = "generic_key"
@@ -48,13 +48,13 @@
 		icon_state = initial(icon_state)
 		update_icon()
 
-/obj/machinery/computer/update_icon()
-	cut_overlays()
+/obj/machinery/computer/update_overlays()
+	. = ..()
 	SSvis_overlays.remove_vis_overlay(src, managed_vis_overlays)
 	if(stat & NOPOWER)
-		add_overlay("[icon_keyboard]_off")
+		. += "[icon_keyboard]_off"
 		return
-	add_overlay(icon_keyboard)
+	. += icon_keyboard
 
 	// This whole block lets screens ignore lighting and be visible even in the darkest room
 	// We can't do this for many things that emit light unfortunately because it layers over things that would be on top of it

code/game/machinery/computer/aifixer.dm

@@ -103,21 +103,20 @@
 		add_fingerprint(usr)
 	updateUsrDialog()
 
-/obj/machinery/computer/aifixer/update_icon()
-	..()
+/obj/machinery/computer/aifixer/update_overlays()
+	. = ..()
 	if(stat & (NOPOWER|BROKEN))
 		return
+	if(active)
+		. += "ai-fixer-on"
+	if (occupier)
+		switch (occupier.stat)
+			if (0)
+				. += "ai-fixer-full"
+			if (2)
+				. += "ai-fixer-404"
 	else
-		if(active)
-			add_overlay("ai-fixer-on")
-		if (occupier)
-			switch (occupier.stat)
-				if (0)
-					add_overlay("ai-fixer-full")
-				if (2)
-					add_overlay("ai-fixer-404")
-		else
-			add_overlay("ai-fixer-empty")
+		. += "ai-fixer-empty"
 
 /obj/machinery/computer/aifixer/transfer_ai(interaction, mob/user, mob/living/silicon/ai/AI, obj/item/aicard/card)
 	if(!..())

code/game/machinery/computer/atmos_alert.dm

@@ -78,23 +78,20 @@
 	update_icon()
 	return
 
-/obj/machinery/computer/atmos_alert/update_icon()
-	..()
-	cut_overlays()
+/obj/machinery/computer/atmos_alert/update_overlays()
+	. = ..()
 	SSvis_overlays.remove_vis_overlay(src, managed_vis_overlays)
 	var/overlay_state = icon_screen
 	if(stat & (NOPOWER|BROKEN))
-		add_overlay("[icon_keyboard]_off")
+		. |= "[icon_keyboard]_off"
 		return
-	add_overlay(icon_keyboard)
+	. |= icon_keyboard
 	if(priority_alarms.len)
 		overlay_state = "alert:2"
-		add_overlay("alert:2")
 	else if(minor_alarms.len)
 		overlay_state = "alert:1"
-		add_overlay("alert:1")
 	else
 		overlay_state = "alert:0"
-		add_overlay("alert:0")
+	. |= overlay_state
 	SSvis_overlays.add_vis_overlay(src, icon, overlay_state, layer, plane, dir)
 	SSvis_overlays.add_vis_overlay(src, icon, overlay_state, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir, alpha=128)

code/game/machinery/computer/atmos_control.dm

@@ -41,7 +41,7 @@
 	name = "incinerator chamber gas sensor"
 	id_tag = ATMOS_GAS_MONITOR_SENSOR_INCINERATOR
 
-/obj/machinery/air_sensor/update_icon()
+/obj/machinery/air_sensor/update_icon_state()
 		icon_state = "gsensor[on]"
 
 /obj/machinery/air_sensor/process_atmos()

code/game/machinery/computer/camera.dm

@@ -175,11 +175,10 @@
 	clockwork = TRUE //it'd look very weird
 	light_power = 0
 
-/obj/machinery/computer/security/telescreen/update_icon()
+/obj/machinery/computer/security/telescreen/update_icon_state()
 	icon_state = initial(icon_state)
 	if(stat & BROKEN)
 		icon_state += "b"
-	return
 
 /obj/machinery/computer/security/telescreen/entertainment
 	name = "entertainment monitor"

code/game/machinery/computer/communications.dm

@@ -194,7 +194,7 @@
 				state = STATE_CANCELSHUTTLE
 		if("cancelshuttle2")
 			if(authenticated)
-				if((world.realtime - SSshuttle.realtimeofstart) > SSshuttle.auto_call) //Citadel Edit Removing auto_call caused recall.
+				if(SSshuttle.endvote_passed) //Citadel Edit - endvote passing = no recalls
 					say("Warning: Emergency shuttle recalls have been blocked by Central Command due to ongoing crew transfer procedures.")
 				else
 					SSshuttle.cancelEvac(usr)

code/game/machinery/computer/crew.dm

@@ -40,6 +40,7 @@ GLOBAL_DATUM_INIT(crewmonitor, /datum/crewmonitor, new)
 	jobs["Geneticist"] = 22
 	jobs["Virologist"] = 23
 	jobs["Medical Doctor"] = 24
+	jobs["Paramedic"] = 25
 	jobs["Research Director"] = 30
 	jobs["Scientist"] = 31
 	jobs["Roboticist"] = 32
@@ -207,4 +208,4 @@ GLOBAL_DATUM_INIT(crewmonitor, /datum/crewmonitor, new)
 		if ("select_person")
 			AI.ai_camera_track(params["name"])
 
-#undef SENSORS_UPDATE_PERIOD
+#undef SENSORS_UPDATE_PERIOD

code/game/machinery/computer/station_alert.dm

@@ -75,25 +75,23 @@
 				L -= I
 	return !cleared
 
-/obj/machinery/computer/station_alert/update_icon()
-	..()
-	cut_overlays()
+/obj/machinery/computer/station_alert/update_overlays()
+	. = ..()
 	SSvis_overlays.remove_vis_overlay(src, managed_vis_overlays)
 	var/overlay_state = icon_screen
 	if(stat & (NOPOWER|BROKEN))
-		add_overlay("[icon_keyboard]_off")
+		. |= "[icon_keyboard]_off"
 		return
-	add_overlay(icon_keyboard)
+	. |= icon_keyboard
 	var/active_alarms = FALSE
 	for(var/cat in alarms)
-		var/list/L = alarms[cat]
-		if(L.len)
+		if(length(alarms[cat]))
 			active_alarms = TRUE
+			break
 	if(active_alarms)
 		overlay_state = "alert:2"
-		add_overlay("alert:2")
 	else
 		overlay_state = "alert:0"
-		add_overlay("alert:0")
+	. |= overlay_state
 	SSvis_overlays.add_vis_overlay(src, icon, overlay_state, layer, plane, dir)
-	SSvis_overlays.add_vis_overlay(src, icon, overlay_state, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir, alpha=128)
+	SSvis_overlays.add_vis_overlay(src, icon, overlay_state, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir, alpha=128)

code/game/machinery/computer/telecrystalconsoles.dm

@@ -44,8 +44,8 @@ GLOBAL_LIST_INIT(possible_uplinker_IDs, list("Alfa","Bravo","Charlie","Delta","E
 	else
 		to_chat(user, "<span class='notice'>[I] doesn't appear to be an uplink...</span>")
 
-/obj/machinery/computer/telecrystals/uplinker/update_icon()
-	..()
+/obj/machinery/computer/telecrystals/uplinker/update_overlays()
+	. = ..()
 	if(uplinkholder)
 		add_overlay("[initial(icon_state)]-closed")
 

code/game/machinery/dance_machine.dm

@@ -45,7 +45,7 @@
 			return
 	return ..()
 
-/obj/machinery/jukebox/update_icon()
+/obj/machinery/jukebox/update_icon_state()
 	if(active)
 		icon_state = "[initial(icon_state)]-active"
 	else

code/game/machinery/defibrillator_mount.dm

@@ -145,7 +145,7 @@
 	desc = "A frame for a defibrillator mount. It can't be removed once it's placed."
 	icon = 'icons/obj/machines/defib_mount.dmi'
 	icon_state = "defibrillator_mount"
-	materials = list(MAT_METAL = 300, MAT_GLASS = 100)
+	custom_materials = list(/datum/material/iron = 300, /datum/material/glass = 100)
 	w_class = WEIGHT_CLASS_BULKY
 	result_path = /obj/machinery/defibrillator_mount
 	pixel_shift = -28

code/game/machinery/deployable.dm

@@ -15,7 +15,7 @@
 	density = TRUE
 	max_integrity = 100
 	var/proj_pass_rate = 50 //How many projectiles will pass the cover. Lower means stronger cover
-	var/material = METAL
+	var/bar_material = METAL
 
 /obj/structure/barricade/deconstruct(disassembled = TRUE)
 	if(!(flags_1 & NODECONSTRUCT_1))
@@ -26,7 +26,7 @@
 	return
 
 /obj/structure/barricade/attackby(obj/item/I, mob/user, params)
-	if(istype(I, /obj/item/weldingtool) && user.a_intent != INTENT_HARM && material == METAL)
+	if(istype(I, /obj/item/weldingtool) && user.a_intent != INTENT_HARM && bar_material == METAL)
 		if(obj_integrity < max_integrity)
 			if(!I.tool_start_check(user, amount=0))
 				return
@@ -61,7 +61,7 @@
 	desc = "This space is blocked off by a wooden barricade."
 	icon = 'icons/obj/structures.dmi'
 	icon_state = "woodenbarricade"
-	material = WOOD
+	bar_material = WOOD
 	var/drop_amount = 3
 
 /obj/structure/barricade/wooden/attackby(obj/item/I, mob/user)
@@ -106,7 +106,7 @@
 	max_integrity = 280
 	proj_pass_rate = 20
 	pass_flags = LETPASSTHROW
-	material = SAND
+	bar_material = SAND
 	climbable = TRUE
 	smooth = SMOOTH_TRUE
 	canSmoothWith = list(/obj/structure/barricade/sandbags, /turf/closed/wall, /turf/closed/wall/r_wall, /obj/structure/falsewall, /obj/structure/falsewall/reinforced, /turf/closed/wall/rust, /turf/closed/wall/r_wall/rust, /obj/structure/barricade/security)

code/game/machinery/dna_scanner.dm

@@ -34,7 +34,7 @@
 		if(scan_level >= 3)
 			. += "<span class='notice'>Scanner has been upgraded to support autoprocessing.<span>"
 
-/obj/machinery/dna_scannernew/update_icon()
+/obj/machinery/dna_scannernew/update_icon_state()
 
 	//no power or maintenance
 	if(stat & (NOPOWER|BROKEN))

code/game/machinery/doors/airlock.dm

@@ -47,7 +47,7 @@
 	icon_state = "closed"
 	max_integrity = 300
 	var/normal_integrity = AIRLOCK_INTEGRITY_N
-	integrity_failure = 70
+	integrity_failure = 0.25
 	damage_deflection = AIRLOCK_DAMAGE_DEFLECTION_N
 	autoclose = TRUE
 	secondsElectrified = 0 //How many seconds remain until the door is no longer electrified. -1 if it is permanently electrified until someone fixes it.
@@ -428,7 +428,7 @@
 	else
 		return FALSE
 
-/obj/machinery/door/airlock/update_icon(state=0, override=0)
+/obj/machinery/door/airlock/update_icon_state(state=0, override=0)
 	if(operating && !override)
 		return
 	switch(state)
@@ -469,7 +469,7 @@
 					panel_overlay = get_airlock_overlay("panel_closed", overlays_file)
 			if(welded)
 				weld_overlay = get_airlock_overlay("welded", overlays_file)
-			if(obj_integrity <integrity_failure)
+			if(obj_integrity < integrity_failure * max_integrity)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)
@@ -495,7 +495,7 @@
 					panel_overlay = get_airlock_overlay("panel_closed_protected", overlays_file)
 				else
 					panel_overlay = get_airlock_overlay("panel_closed", overlays_file)
-			if(obj_integrity <integrity_failure)
+			if(obj_integrity < integrity_failure * max_integrity)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)
@@ -517,7 +517,7 @@
 					panel_overlay = get_airlock_overlay("panel_closed_protected", overlays_file)
 				else
 					panel_overlay = get_airlock_overlay("panel_closed", overlays_file)
-			if(obj_integrity <integrity_failure)
+			if(obj_integrity < integrity_failure * max_integrity)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file, ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE)

code/game/machinery/doors/door.dm

@@ -230,7 +230,7 @@
 /obj/machinery/door/proc/unelectrify()
 	secondsElectrified = 0
 
-/obj/machinery/door/update_icon()
+/obj/machinery/door/update_icon_state()
 	if(density)
 		icon_state = "door1"
 	else

code/game/machinery/doors/firedoor.dm

@@ -171,16 +171,20 @@
 		if("closing")
 			flick("door_closing", src)
 
-/obj/machinery/door/firedoor/update_icon()
-	cut_overlays()
+/obj/machinery/door/firedoor/update_icon_state()
 	if(density)
 		icon_state = "door_closed"
-		if(welded)
-			add_overlay("welded")
 	else
 		icon_state = "door_open"
-		if(welded)
-			add_overlay("welded_open")
+
+/obj/machinery/door/firedoor/update_overlays()
+	. = ..()
+	if(!welded)
+		return
+	if(density)
+		. += "welded"
+	else
+		. += "welded_open"
 
 /obj/machinery/door/firedoor/open()
 	. = ..()
@@ -283,8 +287,7 @@
 		if(CONSTRUCTION_NOCIRCUIT)
 			. += "<span class='notice'>There are no <i>firelock electronics</i> in the frame. The frame could be <b>cut</b> apart.</span>"
 
-/obj/structure/firelock_frame/update_icon()
-	..()
+/obj/structure/firelock_frame/update_icon_state()
 	icon_state = "frame[constructionStep]"
 
 /obj/structure/firelock_frame/attackby(obj/item/C, mob/user)

code/game/machinery/doors/passworddoor.dm

@@ -42,7 +42,7 @@
 		else
 			do_animate("deny")
 
-/obj/machinery/door/password/update_icon()
+/obj/machinery/door/password/update_icon_state()
 	if(density)
 		icon_state = "closed"
 	else

code/game/machinery/doors/poddoor.dm

@@ -77,7 +77,7 @@
 			flick("closing", src)
 			playsound(src, 'sound/machines/blastdoor.ogg', 30, 1)
 
-/obj/machinery/door/poddoor/update_icon()
+/obj/machinery/door/poddoor/update_icon_state()
 	if(density)
 		icon_state = "closed"
 	else

code/game/machinery/doors/windowdoor.dm

@@ -48,7 +48,7 @@
 	electronics = null
 	return ..()
 
-/obj/machinery/door/window/update_icon()
+/obj/machinery/door/window/update_icon_state()
 	if(density)
 		icon_state = base_state
 	else

code/game/machinery/droneDispenser.dm

@@ -11,7 +11,7 @@
 	density = TRUE
 
 	max_integrity = 250
-	integrity_failure = 80
+	integrity_failure = 0.33
 
 	// These allow for different icons when creating custom dispensers
 	var/icon_off = "off"
@@ -50,10 +50,10 @@
 
 /obj/machinery/droneDispenser/Initialize()
 	. = ..()
-	var/datum/component/material_container/materials = AddComponent(/datum/component/material_container, list(MAT_METAL, MAT_GLASS), MINERAL_MATERIAL_AMOUNT * MAX_STACK_SIZE * 2, TRUE, /obj/item/stack)
-	materials.insert_amount(starting_amount)
+	var/datum/component/material_container/materials = AddComponent(/datum/component/material_container, list(/datum/material/iron, /datum/material/glass), MINERAL_MATERIAL_AMOUNT * MAX_STACK_SIZE * 2, TRUE, /obj/item/stack)
+	materials.insert_amount_mat(starting_amount)
 	materials.precise_insertion = TRUE
-	using_materials = list(MAT_METAL=metal_cost, MAT_GLASS=glass_cost)
+	using_materials = list(/datum/material/iron = metal_cost, /datum/material/glass = glass_cost)
 
 /obj/machinery/droneDispenser/preloaded
 	starting_amount = 5000
@@ -168,7 +168,7 @@
 			update_icon()
 
 		if(DRONE_PRODUCTION)
-			materials.use_amount(using_materials)
+			materials.use_materials(using_materials)
 			if(power_used)
 				use_power(power_used)
 
@@ -199,7 +199,7 @@
 		if(istype(a, dispense_type))
 			.++
 
-/obj/machinery/droneDispenser/update_icon()
+/obj/machinery/droneDispenser/update_icon_state()
 	if(stat & (BROKEN|NOPOWER))
 		icon_state = icon_off
 	else if(mode == DRONE_RECHARGING)

code/game/machinery/embedded_controller/access_controller.dm

@@ -84,7 +84,7 @@
 		busy = FALSE
 		update_icon()
 
-/obj/machinery/doorButtons/access_button/update_icon()
+/obj/machinery/doorButtons/access_button/update_icon_state()
 	if(stat & NOPOWER)
 		icon_state = "access_button_off"
 	else
@@ -249,7 +249,7 @@
 		else if(A.id_tag == idExterior)
 			exteriorAirlock = A
 
-/obj/machinery/doorButtons/airlock_controller/update_icon()
+/obj/machinery/doorButtons/airlock_controller/update_icon_state()
 	if(stat & NOPOWER)
 		icon_state = "access_control_off"
 		return

code/game/machinery/embedded_controller/airlock_controller.dm

@@ -255,7 +255,7 @@
 	new_prog.master = src
 	program = new_prog
 
-/obj/machinery/embedded_controller/radio/airlock_controller/update_icon()
+/obj/machinery/embedded_controller/radio/airlock_controller/update_icon_state()
 	if(on && program)
 		if(program.memory["processing"])
 			icon_state = "airlock_control_process"

code/game/machinery/embedded_controller/embedded_controller_base.dm

@@ -33,8 +33,6 @@
 	popup.set_content(return_text())
 	popup.open()
 
-/obj/machinery/embedded_controller/update_icon()
-
 /obj/machinery/embedded_controller/proc/return_text()
 
 /obj/machinery/embedded_controller/proc/post_signal(datum/signal/signal, comm_line)

code/game/machinery/embedded_controller/simple_vent_controller.dm

@@ -54,7 +54,7 @@
 	new_prog.master = src
 	program = new_prog
 
-/obj/machinery/embedded_controller/radio/simple_vent_controller/update_icon()
+/obj/machinery/embedded_controller/radio/simple_vent_controller/update_icon_state()
 	if(on && program)
 		icon_state = "airlock_control_standby"
 	else

code/game/machinery/firealarm.dm

@@ -17,7 +17,7 @@
 	icon = 'icons/obj/monitors.dmi'
 	icon_state = "fire0"
 	max_integrity = 250
-	integrity_failure = 100
+	integrity_failure = 0.4
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 100, "rad" = 100, "fire" = 90, "acid" = 30)
 	use_power = IDLE_POWER_USE
 	idle_power_usage = 2
@@ -55,10 +55,7 @@
 	..()
 	update_icon()
 
-/obj/machinery/firealarm/update_icon()
-	cut_overlays()
-	SSvis_overlays.remove_vis_overlay(src, managed_vis_overlays)
-
+/obj/machinery/firealarm/update_icon_state()
 	if(panel_open)
 		icon_state = "fire_b[buildstage]"
 		return
@@ -72,26 +69,30 @@
 	if(stat & NOPOWER)
 		return
 
-	add_overlay("fire_overlay")
+/obj/machinery/firealarm/update_overlays()
+	. = ..()
+	SSvis_overlays.remove_vis_overlay(src, managed_vis_overlays)
+
+	. += "fire_overlay"
 
 	if(is_station_level(z))
-		add_overlay("fire_[GLOB.security_level]")
+		. += "fire_[GLOB.security_level]"
 		SSvis_overlays.add_vis_overlay(src, icon, "fire_[GLOB.security_level]", ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir)
 	else
-		add_overlay("fire_[SEC_LEVEL_GREEN]")
+		. += "fire_[SEC_LEVEL_GREEN]"
 		SSvis_overlays.add_vis_overlay(src, icon, "fire_[SEC_LEVEL_GREEN]", ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir)
 
 	var/area/A = src.loc
 	A = A.loc
 
 	if(!detecting || !A.fire)
-		add_overlay("fire_off")
+		. += "fire_off"
 		SSvis_overlays.add_vis_overlay(src, icon, "fire_off", ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir)
 	else if(obj_flags & EMAGGED)
-		add_overlay("fire_emagged")
+		. += "fire_emagged"
 		SSvis_overlays.add_vis_overlay(src, icon, "fire_emagged", ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir)
 	else
-		add_overlay("fire_on")
+		. += "fire_on"
 		SSvis_overlays.add_vis_overlay(src, icon, "fire_on", ABOVE_LIGHTING_LAYER, ABOVE_LIGHTING_PLANE, dir)
 
 /obj/machinery/firealarm/emp_act(severity)

code/game/machinery/flasher.dm

@@ -6,7 +6,7 @@
 	icon = 'icons/obj/stationobjs.dmi'
 	icon_state = "mflash1"
 	max_integrity = 250
-	integrity_failure = 100
+	integrity_failure = 0.4
 	light_color = LIGHT_COLOR_WHITE
 	light_power = FLASH_LIGHT_POWER
 	var/obj/item/assembly/flash/handheld/bulb

code/game/machinery/gulag_teleporter.dm

@@ -68,7 +68,7 @@ The console is located at computer/gulag_teleporter.dm
 
 	return ..()
 
-/obj/machinery/gulag_teleporter/update_icon()
+/obj/machinery/gulag_teleporter/update_icon_state()
 	icon_state = initial(icon_state) + (state_open ? "_open" : "")
 	//no power or maintenance
 	if(stat & (NOPOWER|BROKEN))

code/game/machinery/harvester.dm

@@ -11,6 +11,7 @@
 	light_color = LIGHT_COLOR_BLUE
 	var/interval = 20
 	var/harvesting = FALSE
+	var/warming_up = FALSE
 	var/list/operation_order = list() //Order of wich we harvest limbs.
 	var/allow_clothing = FALSE
 	var/allow_living = FALSE
@@ -27,12 +28,11 @@
 		max_time -= L.rating
 	interval = max(max_time,1)
 
-/obj/machinery/harvester/update_icon(warming_up)
-	if(warming_up)
-		icon_state = initial(icon_state)+"-charging"
-		return
+/obj/machinery/harvester/update_icon_state()
 	if(state_open)
 		icon_state = initial(icon_state)+"-open"
+	else if(warming_up)
+		icon_state = initial(icon_state)+"-charging"
 	else if(harvesting)
 		icon_state = initial(icon_state)+"-active"
 	else
@@ -43,6 +43,7 @@
 		return
 	. = ..()
 	harvesting = FALSE
+	warming_up = FALSE
 
 /obj/machinery/harvester/attack_hand(mob/user)
 	if(state_open)
@@ -86,13 +87,15 @@
 		return
 	var/mob/living/carbon/C = occupant
 	operation_order = reverseList(C.bodyparts)   //Chest and head are first in bodyparts, so we invert it to make them suffer more
+	warming_up = TRUE
 	harvesting = TRUE
 	visible_message("<span class='notice'>The [name] begins warming up!</span>")
 	say("Initializing harvest protocol.")
-	update_icon(TRUE)
+	update_icon()
 	addtimer(CALLBACK(src, .proc/harvest), interval)
 
 /obj/machinery/harvester/proc/harvest()
+	warming_up = FALSE
 	update_icon()
 	if(!harvesting || state_open || !powered(EQUIP) || !occupant || !iscarbon(occupant))
 		return
@@ -127,6 +130,7 @@
 	addtimer(CALLBACK(src, .proc/harvest), interval)
 
 /obj/machinery/harvester/proc/end_harvesting()
+	warming_up = FALSE
 	harvesting = FALSE
 	open_machine()
 	say("Subject has been successfully harvested.")

code/game/machinery/hologram.dm

@@ -441,7 +441,7 @@ For the other part of the code, check silicon say.dm. Particularly robot talk.*/
 		set_light(0)
 	update_icon()
 
-/obj/machinery/holopad/update_icon()
+/obj/machinery/holopad/update_icon_state()
 	var/total_users = LAZYLEN(masters) + LAZYLEN(holo_calls)
 	if(ringing)
 		icon_state = "holopad_ringing"

code/game/machinery/iv_drip.dm

@@ -24,7 +24,7 @@
 	QDEL_NULL(beaker)
 	return ..()
 
-/obj/machinery/iv_drip/update_icon()
+/obj/machinery/iv_drip/update_icon_state()
 	if(attached)
 		if(mode)
 			icon_state = "injecting"
@@ -36,13 +36,14 @@
 		else
 			icon_state = "donateidle"
 
-	cut_overlays()
+/obj/machinery/iv_drip/update_overlays()
+	. = ..()
 
 	if(beaker)
 		if(attached)
-			add_overlay("beakeractive")
+			. += "beakeractive"
 		else
-			add_overlay("beakeridle")
+			. += "beakeridle"
 		if(beaker.reagents.total_volume)
 			var/mutable_appearance/filling_overlay = mutable_appearance('icons/obj/iv_drip.dmi', "reagent")
 
@@ -64,7 +65,7 @@
 					filling_overlay.icon_state = "reagent100"
 
 			filling_overlay.color = mix_color_from_reagents(beaker.reagents.reagent_list)
-			add_overlay(filling_overlay)
+			. += filling_overlay
 
 /obj/machinery/iv_drip/MouseDrop(mob/living/target)
 	. = ..()
@@ -227,9 +228,9 @@
 	desc = "An IV drip with an advanced infusion pump that can both drain blood into and inject liquids from attached containers. Blood packs are processed at an accelerated rate. This one is telescopic, and can be picked up and put down."
 	icon_state = "iv_drip"
 
-/obj/machinery/iv_drip/telescopic/update_icon()
+/obj/machinery/iv_drip/telescopic/update_icon_state()
 	..()
-	icon_state = icon_state + "_tele"
+	icon_state += "_tele"
 
 /obj/machinery/iv_drip/telescopic/AltClick(mob/user)
 	if (attached || beaker || !user.canUseTopic(src, BE_CLOSE))

code/game/machinery/lightswitch.dm

@@ -23,7 +23,7 @@
 	on = area.lightswitch
 	update_icon()
 
-/obj/machinery/light_switch/update_icon()
+/obj/machinery/light_switch/update_icon_state()
 	if(stat & NOPOWER)
 		icon_state = "light-p"
 	else

code/game/machinery/magnet.dm

@@ -49,7 +49,7 @@
 	update_icon()
 
 // update the icon_state
-/obj/machinery/magnetic_module/update_icon()
+/obj/machinery/magnetic_module/update_icon_state()
 	var/state="floor_magnet"
 	var/onstate=""
 	if(!on)

code/game/machinery/navbeacon.dm

@@ -75,7 +75,7 @@
 	update_icon()
 
 // update the icon_state
-/obj/machinery/navbeacon/update_icon()
+/obj/machinery/navbeacon/update_icon_state()
 	var/state="navbeacon[open]"
 
 	if(invisibility)

code/game/machinery/porta_turret/portable_turret.dm

@@ -26,7 +26,7 @@
 	var/raising= 0			//if the turret is currently opening or closing its cover
 
 	max_integrity = 160		//the turret's health
-	integrity_failure = 80
+	integrity_failure = 0.5
 	armor = list("melee" = 50, "bullet" = 30, "laser" = 30, "energy" = 30, "bomb" = 30, "bio" = 0, "rad" = 0, "fire" = 90, "acid" = 90)
 
 	var/locked = TRUE			//if the turret's behaviour control access is locked
@@ -99,8 +99,7 @@
 	if(!has_cover)
 		INVOKE_ASYNC(src, .proc/popUp)
 
-/obj/machinery/porta_turret/update_icon()
-	cut_overlays()
+/obj/machinery/porta_turret/update_icon_state()
 	if(!anchored)
 		icon_state = "turretCover"
 		return
@@ -717,7 +716,6 @@
 	return 10 //Syndicate turrets shoot everything not in their faction
 
 /obj/machinery/porta_turret/syndicate/pod
-	integrity_failure = 20
 	max_integrity = 40
 	stun_projectile = /obj/item/projectile/bullet/syndicate_turret
 	lethal_projectile = /obj/item/projectile/bullet/syndicate_turret
@@ -799,7 +797,6 @@
 
 /obj/machinery/porta_turret/centcom_shuttle/weak
 	max_integrity = 120
-	integrity_failure = 60
 	name = "Old Laser Turret"
 	desc = "A turret built with substandard parts and run down further with age. Still capable of delivering lethal lasers to the odd space carp, but not much else."
 	stun_projectile = /obj/item/projectile/beam/weak/penetrator
@@ -972,8 +969,7 @@
 	..()
 	update_icon()
 
-/obj/machinery/turretid/update_icon()
-	..()
+/obj/machinery/turretid/update_icon_state()
 	if(stat & NOPOWER)
 		icon_state = "control_off"
 	else if (enabled)
@@ -989,7 +985,7 @@
 	desc = "Used for building turret control panels."
 	icon_state = "apc"
 	result_path = /obj/machinery/turretid
-	materials = list(MAT_METAL=MINERAL_MATERIAL_AMOUNT)
+	custom_materials = list(/datum/material/iron=MINERAL_MATERIAL_AMOUNT)
 
 /obj/item/gun/proc/get_turret_properties()
 	. = list()

code/game/machinery/recharger.dm

@@ -10,12 +10,14 @@
 	pass_flags = PASSTABLE
 	var/obj/item/charging = null
 	var/recharge_coeff = 1
+	var/using_power = FALSE //Did we put power into "charging" last process()?
 
 	var/static/list/allowed_devices = typecacheof(list(
 		/obj/item/gun/energy,
 		/obj/item/melee/baton,
 		/obj/item/ammo_box/magazine/recharge,
 		/obj/item/modular_computer,
+		/obj/item/twohanded/electrostaff,
 		/obj/item/gun/ballistic/automatic/magrifle))
 
 /obj/machinery/recharger/RefreshParts()
@@ -44,9 +46,11 @@
 	if (new_charging)
 		START_PROCESSING(SSmachines, src)
 		use_power = ACTIVE_POWER_USE
-		update_icon(scan = TRUE)
+		using_power = TRUE
+		update_icon()
 	else
 		use_power = IDLE_POWER_USE
+		using_power = FALSE
 		update_icon()
 
 /obj/machinery/recharger/attackby(obj/item/G, mob/user, params)
@@ -119,23 +123,23 @@
 	if(stat & (NOPOWER|BROKEN) || !anchored)
 		return PROCESS_KILL
 
-	var/using_power = 0
+	using_power = FALSE
 	if(charging)
 		var/obj/item/stock_parts/cell/C = charging.get_cell()
 		if(C)
 			if(C.charge < C.maxcharge)
 				C.give(C.chargerate * recharge_coeff)
 				use_power(250 * recharge_coeff)
-				using_power = 1
-			update_icon(using_power)
+				using_power = TRUE
+			update_icon()
 
 		if(istype(charging, /obj/item/ammo_box/magazine/recharge))
 			var/obj/item/ammo_box/magazine/recharge/R = charging
 			if(R.stored_ammo.len < R.max_ammo)
 				R.stored_ammo += new R.ammo_type(R)
 				use_power(200 * recharge_coeff)
-				using_power = 1
-			update_icon(using_power)
+				using_power = TRUE
+			update_icon()
 			return
 	else
 		return PROCESS_KILL
@@ -160,20 +164,15 @@
 				B.cell.charge = 0
 
 
-/obj/machinery/recharger/update_icon(using_power = 0, scan)	//we have an update_icon() in addition to the stuff in process to make it feel a tiny bit snappier.
+/obj/machinery/recharger/update_icon_state()
 	if(stat & (NOPOWER|BROKEN) || !anchored)
 		icon_state = "rechargeroff"
-		return
-	if(scan)
-		icon_state = "rechargeroff"
-		return
-	if(panel_open)
+	else if(panel_open)
 		icon_state = "rechargeropen"
-		return
-	if(charging)
+	else if(charging)
 		if(using_power)
 			icon_state = "recharger1"
 		else
 			icon_state = "recharger2"
-		return
-	icon_state = "recharger0"
+	else
+		icon_state = "recharger0"

code/game/machinery/rechargestation.dm

@@ -112,7 +112,7 @@
 			use_power = ACTIVE_POWER_USE
 		add_fingerprint(occupant)
 
-/obj/machinery/recharge_station/update_icon()
+/obj/machinery/recharge_station/update_icon_state()
 	if(is_operational())
 		if(state_open)
 			icon_state = "borgcharger0"

code/game/machinery/recycler.dm

@@ -19,7 +19,7 @@
 
 /obj/machinery/recycler/Initialize()
 	AddComponent(/datum/component/butchering/recycler, 1, amount_produced,amount_produced/5)
-	AddComponent(/datum/component/material_container, list(MAT_METAL, MAT_GLASS, MAT_PLASMA, MAT_SILVER, MAT_GOLD, MAT_DIAMOND, MAT_URANIUM, MAT_BANANIUM, MAT_TITANIUM, MAT_BLUESPACE, MAT_PLASTIC), INFINITY, FALSE, null, null, null, TRUE)
+	AddComponent(/datum/component/material_container, list(/datum/material/iron, /datum/material/glass, /datum/material/silver, /datum/material/plasma, /datum/material/gold, /datum/material/diamond, /datum/material/plastic, /datum/material/uranium, /datum/material/bananium, /datum/material/titanium, /datum/material/bluespace), INFINITY, FALSE, null, null, null, TRUE)
 	. = ..()
 	update_icon()
 	req_one_access = get_all_accesses() + get_all_centcom_access()
@@ -77,8 +77,7 @@
 	to_chat(user, "<span class='notice'>You use the cryptographic sequencer on [src].</span>")
 	return TRUE
 
-/obj/machinery/recycler/update_icon()
-	..()
+/obj/machinery/recycler/update_icon_state()
 	var/is_powered = !(stat & (BROKEN|NOPOWER))
 	if(safety_mode)
 		is_powered = FALSE

code/game/machinery/requests_console.dm

@@ -60,7 +60,7 @@ GLOBAL_LIST_EMPTY(allConsoles)
 	..()
 	update_icon()
 
-/obj/machinery/requests_console/update_icon()
+/obj/machinery/requests_console/update_icon_state()
 	if(stat & NOPOWER)
 		set_light(0)
 	else

code/game/machinery/shieldgen.dm

@@ -208,7 +208,7 @@
 	to_chat(user, "<span class='warning'>You short out the access controller.</span>")
 	return TRUE
 
-/obj/machinery/shieldgen/update_icon()
+/obj/machinery/shieldgen/update_icon_state()
 	if(active)
 		icon_state = (stat & BROKEN) ? "shieldonbr":"shieldon"
 	else

code/game/machinery/slotmachine.dm

@@ -26,7 +26,6 @@
 	var/working = 0
 	var/balance = 0 //How much money is in the machine, ready to be CONSUMED.
 	var/jackpots = 0
-	var/list/coinvalues = list()
 	var/list/reels = list(list("", "", "") = 0, list("", "", "") = 0, list("", "", "") = 0, list("", "", "") = 0, list("", "", "") = 0)
 	var/list/symbols = list(SEVEN = 1, "<font color='orange'>&</font>" = 2, "<font color='yellow'>@</font>" = 2, "<font color='green'>$</font>" = 2, "<font color='blue'>?</font>" = 2, "<font color='grey'>#</font>" = 2, "<font color='white'>!</font>" = 2, "<font color='fuchsia'>%</font>" = 2) //if people are winning too much, multiply every number in this list by 2 and see if they are still winning too much.
 
@@ -45,10 +44,6 @@
 
 	toggle_reel_spin(0)
 
-	for(var/cointype in typesof(/obj/item/coin))
-		var/obj/item/coin/C = cointype
-		coinvalues["[cointype]"] = initial(C.value)
-
 /obj/machinery/computer/slot_machine/Destroy()
 	if(balance)
 		give_coins(balance)
@@ -61,7 +56,7 @@
 
 	money++ //SPESSH MAJICKS
 
-/obj/machinery/computer/slot_machine/update_icon()
+/obj/machinery/computer/slot_machine/update_icon_state()
 	if(stat & NOPOWER)
 		icon_state = "slots0"
 
@@ -92,7 +87,7 @@
 		else
 			if(!user.temporarilyRemoveItemFromInventory(C))
 				return
-			to_chat(user, "<span class='notice'>You insert a [C.cmineral] coin into [src]'s slot!</span>")
+			to_chat(user, "<span class='notice'>You insert [C] into [src]'s slot!</span>")
 			balance += C.value
 			qdel(C)
 	else
@@ -294,19 +289,22 @@
 
 	return amount
 
-/obj/machinery/computer/slot_machine/proc/dispense(amount = 0, cointype = /obj/item/coin/silver, mob/living/target, throwit = 0)
-	var/value = coinvalues["[cointype]"]
+/obj/machinery/computer/slot_machine/proc/dispense(amount = 0, cointype = /obj/item/coin/silver, mob/living/target, throwit = FALSE)
+	var/value = GLOB.coin_values[cointype] || GLOB.coin_values[/obj/item/coin/iron]
+	INVOKE_ASYNC(src, .proc/become_rich, amount, value, cointype, target, throwit)
+	return amount % value
 
-
-	while(amount >= value)
+/obj/machinery/computer/slot_machine/proc/become_rich(amount, value, cointype = /obj/item/coin/silver, mob/living/target, throwit = FALSE)
+	if(value <= 0)
+		return
+	while(amount >= value && !QDELETED(src))
 		var/obj/item/coin/C = new cointype(loc) //DOUBLE THE PAIN
 		amount -= value
 		if(throwit && target)
 			C.throw_at(target, 3, 10)
 		else
 			random_step(C, 2, 40)
-
-	return amount
+		CHECK_TICK
 
 #undef SEVEN
 #undef SPIN_TIME

code/game/machinery/spaceheater.dm

@@ -53,17 +53,18 @@
 	else
 		. += "There is no power cell installed."
 	if(in_range(user, src) || isobserver(user))
-		. += "<span class='notice'>The status display reads: Temperature range at <b>[settableTemperatureRange]°C</b>.<br>Heating power at <b>[heatingPower*0.001]kJ</b>.<br>Power consumption at <b>[(efficiency*-0.0025)+150]%</b>.<span>" //100%, 75%, 50%, 25%	
+		. += "<span class='notice'>The status display reads: Temperature range at <b>[settableTemperatureRange]°C</b>.<br>Heating power at <b>[heatingPower*0.001]kJ</b>.<br>Power consumption at <b>[(efficiency*-0.0025)+150]%</b>.<span>" //100%, 75%, 50%, 25%
 
-/obj/machinery/space_heater/update_icon()
+/obj/machinery/space_heater/update_icon_state()
 	if(on)
 		icon_state = "sheater-[mode]"
 	else
 		icon_state = "sheater-off"
 
-	cut_overlays()
+/obj/machinery/space_heater/update_overlays()
+	. = ..()
 	if(panel_open)
-		add_overlay("sheater-open")
+		. += "sheater-open"
 
 /obj/machinery/space_heater/process()
 	if(!on || !is_operational())

code/game/machinery/suit_storage_unit.dm

@@ -134,29 +134,28 @@
 	QDEL_NULL(storage)
 	return ..()
 
-/obj/machinery/suit_storage_unit/update_icon()
-	cut_overlays()
-
+/obj/machinery/suit_storage_unit/update_overlays()
+	. = ..()
 	if(uv)
 		if(uv_super)
-			add_overlay("super")
+			. += "super"
 		else if(occupant)
-			add_overlay("uvhuman")
+			. += "uvhuman"
 		else
-			add_overlay("uv")
+			. += "uv"
 	else if(state_open)
 		if(stat & BROKEN)
-			add_overlay("broken")
+			. += "broken"
 		else
-			add_overlay("open")
+			. += "open"
 			if(suit)
-				add_overlay("suit")
+				. += "suit"
 			if(helmet)
-				add_overlay("helm")
+				. += "helm"
 			if(storage)
-				add_overlay("storage")
+				. += "storage"
 	else if(occupant)
-		add_overlay("human")
+		. += "human"
 
 /obj/machinery/suit_storage_unit/power_change()
 	..()

code/game/machinery/syndicatebomb.dm

@@ -102,7 +102,7 @@
 	. = ..()
 	. += "A digital display on it reads \"[seconds_remaining()]\"."
 
-/obj/machinery/syndicatebomb/update_icon()
+/obj/machinery/syndicatebomb/update_icon_state()
 	icon_state = "[initial(icon_state)][active ? "-active" : "-inactive"][open_panel ? "-wires" : ""]"
 
 /obj/machinery/syndicatebomb/proc/seconds_remaining()

code/game/machinery/telecomms/machines/message_server.dm

@@ -74,7 +74,7 @@
 	if(!relay_information(signal, /obj/machinery/telecomms/hub))
 		relay_information(signal, /obj/machinery/telecomms/broadcaster)
 
-/obj/machinery/telecomms/message_server/update_icon()
+/obj/machinery/telecomms/message_server/update_icon_state()
 	if((stat & (BROKEN|NOPOWER)))
 		icon_state = "server-nopower"
 	else if (!toggled)

code/game/machinery/telecomms/telecomunications.dm

@@ -104,7 +104,7 @@ GLOBAL_LIST_EMPTY(telecomms_list)
 					links |= T
 					T.links |= src
 
-/obj/machinery/telecomms/update_icon()
+/obj/machinery/telecomms/update_icon_state()
 	if(on)
 		if(panel_open)
 			icon_state = "[initial(icon_state)]_o"

code/game/machinery/teleporter.dm

@@ -85,7 +85,7 @@
 			calibrated = FALSE
 	return
 
-/obj/machinery/teleport/hub/update_icon()
+/obj/machinery/teleport/hub/update_icon_state()
 	if(panel_open)
 		icon_state = "tele-o"
 	else if(is_ready())
@@ -218,7 +218,7 @@
 	if(teleporter_hub)
 		teleporter_hub.update_icon()
 
-/obj/machinery/teleport/station/update_icon()
+/obj/machinery/teleport/station/update_icon_state()
 	if(panel_open)
 		icon_state = "controller-o"
 	else if(stat & (BROKEN|NOPOWER))

code/game/machinery/toylathe.dm

@@ -46,7 +46,7 @@
 							)
 
 /obj/machinery/autoylathe/Initialize()
-	AddComponent(/datum/component/material_container, list(MAT_METAL, MAT_GLASS, MAT_PLASTIC), 0, TRUE, null, null, CALLBACK(src, .proc/AfterMaterialInsert))
+	AddComponent(/datum/component/material_container, list(/datum/material/iron, /datum/material/glass, /datum/material/plastic), 0, TRUE, null, null, CALLBACK(src, .proc/AfterMaterialInsert))
 	. = ..()
 
 	wires = new /datum/wires/autoylathe(src)
@@ -120,18 +120,13 @@
 
 	return ..()
 
-/obj/machinery/autoylathe/proc/AfterMaterialInsert(type_inserted, id_inserted, amount_inserted)
-	if(ispath(type_inserted, /obj/item/stack/ore/bluespace_crystal))
-		use_power(amount_inserted / 10)
+/obj/machinery/autoylathe/proc/AfterMaterialInsert(obj/item/item_inserted, id_inserted, amount_inserted)
+	if(item_inserted.custom_materials?.len && item_inserted.custom_materials[getmaterialref(/datum/material/glass)])
+		flick("autolathe_r",src)//plays glass insertion animation by default otherwise
 	else
-		switch(id_inserted)
-			if (MAT_METAL)
-				flick("autolathe_o",src)//plays metal insertion animation
-			if (MAT_GLASS)
-				flick("autolathe_r",src)//plays glass insertion animation
-			if (MAT_PLASTIC)
-				flick("autolathe_o",src)//plays metal insertion animation
-		use_power(amount_inserted / 10)
+		flick("autolathe_o",src)//plays metal insertion animation
+
+	use_power(min(1000, amount_inserted / 100))
 	updateUsrDialog()
 
 /obj/machinery/autoylathe/Topic(href, href_list)
@@ -161,18 +156,40 @@
 			/////////////////
 
 			var/coeff = (is_stack ? 1 : prod_coeff) //stacks are unaffected by production coefficient
-			var/metal_cost = being_built.materials[MAT_METAL]
-			var/glass_cost = being_built.materials[MAT_GLASS]
-			var/plastic_cost = being_built.materials[MAT_PLASTIC]
-			var/power = max(2000, (metal_cost+glass_cost+plastic_cost)*multiplier/5)
+			var/total_amount = 0
+			for(var/MAT in being_built.materials)
+				total_amount += being_built.materials[MAT]
+			var/power = max(2000, (total_amount)*multiplier/5) //Change this to use all materials
 
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			if((materials.amount(MAT_METAL) >= metal_cost*multiplier*coeff) && (materials.amount(MAT_GLASS) >= glass_cost*multiplier*coeff) && (materials.amount(MAT_PLASTIC) >= plastic_cost*multiplier*coeff))
+
+			var/list/materials_used = list()
+			var/list/custom_materials = list() //These will apply their material effect, This should usually only be one.
+
+			for(var/MAT in being_built.materials)
+				var/datum/material/used_material = MAT
+				var/amount_needed = being_built.materials[MAT] * coeff * multiplier
+				if(istext(used_material)) //This means its a category
+					var/list/list_to_show = list()
+					for(var/i in SSmaterials.materials_by_category[used_material])
+						if(materials.materials[i] > 0)
+							list_to_show += i
+
+					used_material = input("Choose [used_material]", "Custom Material") as null|anything in list_to_show
+					if(!used_material)
+						return //Didn't pick any material, so you can't build shit either.
+					custom_materials[used_material] += amount_needed
+
+				materials_used[used_material] = amount_needed
+
+			if(materials.has_materials(materials_used))
 				busy = TRUE
 				use_power(power)
 				icon_state = "autolathe_n"
 				var/time = is_stack ? 32 : 32*coeff*multiplier
-				addtimer(CALLBACK(src, .proc/make_item, power, metal_cost, glass_cost, plastic_cost, multiplier, coeff, is_stack), time)
+				addtimer(CALLBACK(src, .proc/make_item, power, materials_used, custom_materials, multiplier, coeff, is_stack), time)
+			else
+				to_chat(usr, "<span class=\"alert\">Not enough materials for this operation.</span>")
 
 		if(href_list["search"])
 			matching_designs.Cut()
@@ -189,12 +206,11 @@
 
 	return
 
-/obj/machinery/autoylathe/proc/make_item(power, metal_cost, glass_cost, plastic_cost, multiplier, coeff, is_stack)
+/obj/machinery/autoylathe/proc/make_item(power, list/materials_used, list/picked_materials, multiplier, coeff, is_stack)
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 	var/atom/A = drop_location()
 	use_power(power)
-	var/list/materials_used = list(MAT_METAL=metal_cost*coeff*multiplier, MAT_GLASS=glass_cost*coeff*multiplier, MAT_PLASTIC=plastic_cost*coeff*multiplier)
-	materials.use_amount(materials_used)
+	materials.use_materials(materials_used)
 
 	if(is_stack)
 		var/obj/item/stack/N = new being_built.build_path(A, multiplier)
@@ -203,10 +219,9 @@
 	else
 		for(var/i=1, i<=multiplier, i++)
 			var/obj/item/new_item = new being_built.build_path(A)
-			new_item.materials = new_item.materials.Copy()
-			for(var/mat in materials_used)
-				new_item.materials[mat] = materials_used[mat] / multiplier
 			new_item.autoylathe_crafted(src)
+			if(length(picked_materials))
+				new_item.set_custom_materials(picked_materials, 1 / multiplier) //Ensure we get the non multiplied amount
 	icon_state = "autolathe"
 	busy = FALSE
 	updateDialog()
@@ -265,7 +280,9 @@
 
 		if(ispath(D.build_path, /obj/item/stack))
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			var/max_multiplier = min(D.maxstack, D.materials[MAT_METAL] ?round(materials.amount(MAT_METAL)/D.materials[MAT_METAL]):INFINITY,D.materials[MAT_GLASS] ?round(materials.amount(MAT_GLASS)/D.materials[MAT_GLASS]):INFINITY,D.materials[MAT_PLASTIC] ?round(materials.amount(MAT_PLASTIC)/D.materials[MAT_PLASTIC]):INFINITY)
+			var/max_multiplier
+			for(var/datum/material/mat in D.materials)
+				max_multiplier = min(D.maxstack, round(materials.get_material_amount(mat)/D.materials[mat]))
 			if (max_multiplier>10 && !disabled)
 				dat += " <a href='?src=[REF(src)];make=[D.id];multiplier=10'>x10</a>"
 			if (max_multiplier>25 && !disabled)
@@ -297,7 +314,9 @@
 
 		if(ispath(D.build_path, /obj/item/stack))
 			var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-			var/max_multiplier = min(D.maxstack, D.materials[MAT_METAL] ?round(materials.amount(MAT_METAL)/D.materials[MAT_METAL]):INFINITY,D.materials[MAT_GLASS] ?round(materials.amount(MAT_GLASS)/D.materials[MAT_GLASS]):INFINITY,D.materials[MAT_PLASTIC] ?round(materials.amount(MAT_PLASTIC)/D.materials[MAT_PLASTIC]):INFINITY)
+			var/max_multiplier
+			for(var/datum/material/mat in D.materials)
+				max_multiplier = min(D.maxstack, round(materials.get_material_amount(mat)/D.materials[mat]))
 			if (max_multiplier>10 && !disabled)
 				dat += " <a href='?src=[REF(src)];make=[D.id];multiplier=10'>x10</a>"
 			if (max_multiplier>25 && !disabled)
@@ -314,8 +333,10 @@
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 	var/dat = "<b>Total amount:</b> [materials.total_amount] / [materials.max_amount] cm<sup>3</sup><br>"
 	for(var/mat_id in materials.materials)
-		var/datum/material/M = materials.materials[mat_id]
-		dat += "<b>[M.name] amount:</b> [M.amount] cm<sup>3</sup><br>"
+		var/datum/material/M = mat_id
+		var/mineral_amount = materials.materials[mat_id]
+		if(mineral_amount > 0)
+			dat += "<b>[M.name] amount:</b> [mineral_amount] cm<sup>3</sup><br>"
 	return dat
 
 /obj/machinery/autoylathe/proc/can_build(datum/design/D, amount = 1)
@@ -324,24 +345,24 @@
 
 	var/coeff = (ispath(D.build_path, /obj/item/stack) ? 1 : prod_coeff)
 
+	var/list/required_materials = list()
+
+	for(var/i in D.materials)
+		required_materials[i] = D.materials[i] * coeff * amount
+
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-	if(D.materials[MAT_METAL] && (materials.amount(MAT_METAL) < (D.materials[MAT_METAL] * coeff * amount)))
-		return FALSE
-	if(D.materials[MAT_GLASS] && (materials.amount(MAT_GLASS) < (D.materials[MAT_GLASS] * coeff * amount)))
-		return FALSE
-	if(D.materials[MAT_PLASTIC] && (materials.amount(MAT_PLASTIC) < (D.materials[MAT_PLASTIC] * coeff * amount)))
-		return FALSE
-	return TRUE
+
+	return materials.has_materials(required_materials)
 
 /obj/machinery/autoylathe/proc/get_design_cost(datum/design/D)
 	var/coeff = (ispath(D.build_path, /obj/item/stack) ? 1 : prod_coeff)
 	var/dat
-	if(D.materials[MAT_METAL])
-		dat += "[D.materials[MAT_METAL] * coeff] metal "
-	if(D.materials[MAT_GLASS])
-		dat += "[D.materials[MAT_GLASS] * coeff] glass "
-	if(D.materials[MAT_PLASTIC])
-		dat += "[D.materials[MAT_PLASTIC] * coeff] plastic"
+	for(var/i in D.materials)
+		if(istext(i)) //Category handling
+			dat += "[D.materials[i] * coeff] [i]"
+		else
+			var/datum/material/M = i
+			dat += "[D.materials[i] * coeff] [M.name] "
 	return dat
 
 /obj/machinery/autoylathe/proc/reset(wire)

code/game/machinery/transformer.dm

@@ -38,8 +38,7 @@
 	..()
 	update_icon()
 
-/obj/machinery/transformer/update_icon()
-	..()
+/obj/machinery/transformer/update_icon_state()
 	if(stat & (BROKEN|NOPOWER) || cooldown == 1)
 		icon_state = "separator-AO0"
 	else

code/game/machinery/washing_machine.dm

@@ -199,8 +199,7 @@
 
 
 
-/obj/machinery/washing_machine/update_icon()
-	cut_overlays()
+/obj/machinery/washing_machine/update_icon_state()
 	if(busy)
 		icon_state = "wm_running_[bloody_mess]"
 	else if(bloody_mess)
@@ -208,8 +207,11 @@
 	else
 		var/full = contents.len ? 1 : 0
 		icon_state = "wm_[state_open]_[full]"
+
+/obj/machinery/washing_machine/update_overlays()
+	. = ..()
 	if(panel_open)
-		add_overlay("wm_panel")
+		. += "wm_panel"
 
 /obj/machinery/washing_machine/attackby(obj/item/W, mob/user, params)
 	if(panel_open && !busy && default_unfasten_wrench(user, W))

code/game/mecha/equipment/tools/medical_tools.dm

@@ -527,7 +527,8 @@
 	range = MELEE|RANGED
 	equip_cooldown = 0
 	var/obj/item/gun/medbeam/mech/medigun
-	materials = list(MAT_METAL = 15000, MAT_GLASS = 8000, MAT_PLASMA = 3000, MAT_GOLD = 8000, MAT_DIAMOND = 2000)
+	custom_materials = list(/datum/material/iron = 15000, /datum/material/glass = 8000, /datum/material/plasma = 3000, /datum/material/gold = 8000, /datum/material/diamond = 2000)
+	material_flags = MATERIAL_NO_EFFECTS
 
 /obj/item/mecha_parts/mecha_equipment/medical/mechmedbeam/Initialize()
 	. = ..()

code/game/mecha/equipment/tools/other_tools.dm

@@ -388,7 +388,7 @@
 /obj/item/mecha_parts/mecha_equipment/generator/get_equip_info()
 	var/output = ..()
 	if(output)
-		return "[output] \[[fuel]: [round(fuel.amount*fuel.perunit,0.1)] cm<sup>3</sup>\] - <a href='?src=[REF(src)];toggle=1'>[equip_ready?"A":"Dea"]ctivate</a>"
+		return "[output] \[[fuel]: [round(fuel.amount*fuel.mats_per_stack,0.1)] cm<sup>3</sup>\] - <a href='?src=[REF(src)];toggle=1'>[equip_ready?"A":"Dea"]ctivate</a>"
 
 /obj/item/mecha_parts/mecha_equipment/generator/action(target)
 	if(chassis)
@@ -398,9 +398,9 @@
 
 /obj/item/mecha_parts/mecha_equipment/generator/proc/load_fuel(var/obj/item/stack/sheet/P)
 	if(P.type == fuel.type && P.amount > 0)
-		var/to_load = max(max_fuel - fuel.amount*fuel.perunit,0)
+		var/to_load = max(max_fuel - fuel.amount*fuel.mats_per_stack,0)
 		if(to_load)
-			var/units = min(max(round(to_load / P.perunit),1),P.amount)
+			var/units = min(max(round(to_load / P.mats_per_stack),1),P.amount)
 			fuel.amount += units
 			P.use(units)
 			occupant_message("[units] unit\s of [fuel] successfully loaded.")
@@ -454,7 +454,7 @@
 	if(cur_charge < chassis.cell.maxcharge)
 		use_fuel = fuel_per_cycle_active
 		chassis.give_power(power_per_cycle)
-	fuel.amount -= min(use_fuel/fuel.perunit,fuel.amount)
+	fuel.amount -= min(use_fuel/fuel.mats_per_stack,fuel.amount)
 	update_equip_info()
 	return 1
 

code/game/mecha/mech_bay.dm

@@ -128,11 +128,11 @@
 		else
 			recharge_port = null
 
-/obj/machinery/computer/mech_bay_power_console/update_icon()
-	..()
+/obj/machinery/computer/mech_bay_power_console/update_overlays()
+	. = ..()
 	if(!recharge_port || !recharge_port.recharging_mech || !recharge_port.recharging_mech.cell || !(recharge_port.recharging_mech.cell.charge < recharge_port.recharging_mech.cell.maxcharge) || stat & (NOPOWER|BROKEN))
 		return
-	add_overlay("recharge_comp_on")
+	. += "recharge_comp_on"
 
 /obj/machinery/computer/mech_bay_power_console/Initialize()
 	. = ..()

code/game/mecha/mech_fabricator.dm

@@ -36,7 +36,7 @@
 
 /obj/machinery/mecha_part_fabricator/Initialize()
 	var/datum/component/material_container/materials = AddComponent(/datum/component/material_container,
-		list(MAT_METAL, MAT_GLASS, MAT_SILVER, MAT_GOLD, MAT_DIAMOND, MAT_PLASMA, MAT_URANIUM, MAT_BANANIUM, MAT_TITANIUM, MAT_BLUESPACE), 0,
+	list(/datum/material/iron, /datum/material/glass, /datum/material/silver, /datum/material/gold, /datum/material/diamond, /datum/material/plasma, /datum/material/uranium, /datum/material/bananium, /datum/material/titanium, /datum/material/bluespace), 0,
 		TRUE, /obj/item/stack, CALLBACK(src, .proc/is_insertion_ready), CALLBACK(src, .proc/AfterMaterialInsert))
 	materials.precise_insertion = TRUE
 	stored_research = new
@@ -109,7 +109,8 @@
 	var/i = 0
 	var/output
 	for(var/c in D.materials)
-		output += "[i?" | ":null][get_resource_cost_w_coeff(D, c)] [material2name(c)]"
+		var/datum/material/M = c
+		output += "[i?" | ":null][get_resource_cost_w_coeff(D, M)] [M.name]"
 		i++
 	return output
 
@@ -117,20 +118,22 @@
 	var/output
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
 	for(var/mat_id in materials.materials)
-		var/datum/material/M = materials.materials[mat_id]
-		output += "<span class=\"res_name\">[M.name]: </span>[M.amount] cm&sup3;"
-		if(M.amount >= MINERAL_MATERIAL_AMOUNT)
-			output += "<span style='font-size:80%;'>- Remove \[<a href='?src=[REF(src)];remove_mat=1;material=[mat_id]'>1</a>\]"
-			if(M.amount >= (MINERAL_MATERIAL_AMOUNT * 10))
-				output += " | \[<a href='?src=[REF(src)];remove_mat=10;material=[mat_id]'>10</a>\]"
-			output += " | \[<a href='?src=[REF(src)];remove_mat=50;material=[mat_id]'>All</a>\]</span>"
+		var/datum/material/M = mat_id
+		var/amount = materials.materials[mat_id]
+		output += "<span class=\"res_name\">[M.name]: </span>[amount] cm&sup3;"
+		if(amount >= MINERAL_MATERIAL_AMOUNT)
+			output += "<span style='font-size:80%;'>- Remove \[<a href='?src=[REF(src)];remove_mat=1;material=[REF(mat_id)]'>1</a>\]"
+			if(amount >= (MINERAL_MATERIAL_AMOUNT * 10))
+				output += " | \[<a href='?src=[REF(src)];remove_mat=10;material=[REF(M)]'>10</a>\]"
+			output += " | \[<a href='?src=[REF(src)];remove_mat=50;material=[REF(M)]'>All</a>\]</span>"
 		output += "<br/>"
 	return output
 
 /obj/machinery/mecha_part_fabricator/proc/get_resources_w_coeff(datum/design/D)
 	var/list/resources = list()
 	for(var/R in D.materials)
-		resources[R] = get_resource_cost_w_coeff(D, R)
+		var/datum/material/M = R
+		resources[M] = get_resource_cost_w_coeff(D, M)
 	return resources
 
 /obj/machinery/mecha_part_fabricator/proc/check_resources(datum/design/D)
@@ -147,7 +150,7 @@
 	var/list/res_coef = get_resources_w_coeff(D)
 
 	var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-	materials.use_amount(res_coef)
+	materials.use_materials(res_coef)
 	add_overlay("fab-active")
 	use_power = ACTIVE_POWER_USE
 	updateUsrDialog()
@@ -158,7 +161,8 @@
 
 	var/location = get_step(src,(dir))
 	var/obj/item/I = new D.build_path(location)
-	I.materials = res_coef
+	I.material_flags |= MATERIAL_NO_EFFECTS //Find a better way to do this.
+	I.set_custom_materials(res_coef)
 	say("\The [I] is complete.")
 	being_built = null
 
@@ -251,7 +255,7 @@
 	updateUsrDialog()
 	return
 
-/obj/machinery/mecha_part_fabricator/proc/get_resource_cost_w_coeff(datum/design/D, resource, roundto = 1)
+/obj/machinery/mecha_part_fabricator/proc/get_resource_cost_w_coeff(datum/design/D, var/datum/material/resource, roundto = 1)
 	return round(D.materials[resource]*component_coeff, roundto)
 
 /obj/machinery/mecha_part_fabricator/proc/get_construction_time_w_coeff(datum/design/D, roundto = 1) //aran
@@ -390,7 +394,8 @@
 
 	if(href_list["remove_mat"] && href_list["material"])
 		var/datum/component/material_container/materials = GetComponent(/datum/component/material_container)
-		materials.retrieve_sheets(text2num(href_list["remove_mat"]), href_list["material"])
+		var/datum/material/Mat = locate(href_list["material"])
+		materials.retrieve_sheets(text2num(href_list["remove_mat"]), Mat)
 
 	updateUsrDialog()
 	return
@@ -400,10 +405,10 @@
 	materials.retrieve_all()
 	..()
 
-/obj/machinery/mecha_part_fabricator/proc/AfterMaterialInsert(type_inserted, id_inserted, amount_inserted)
-	var/stack_name = material2name(id_inserted)
-	add_overlay("fab-load-[stack_name]")
-	addtimer(CALLBACK(src, /atom/proc/cut_overlay, "fab-load-[stack_name]"), 10)
+/obj/machinery/mecha_part_fabricator/proc/AfterMaterialInsert(item_inserted, id_inserted, amount_inserted)
+	var/datum/material/M = id_inserted
+	add_overlay("fab-load-[M.name]")
+	addtimer(CALLBACK(src, /atom/proc/cut_overlay, "fab-load-[M.name]"), 10)
 	updateUsrDialog()
 
 /obj/machinery/mecha_part_fabricator/attackby(obj/item/W, mob/user, params)
@@ -415,9 +420,6 @@
 
 	return ..()
 
-/obj/machinery/mecha_part_fabricator/proc/material2name(ID)
-	return copytext_char(ID,2)
-
 /obj/machinery/mecha_part_fabricator/proc/is_insertion_ready(mob/user)
 	if(panel_open)
 		to_chat(user, "<span class='warning'>You can't load [src] while it's opened!</span>")

code/game/mecha/working/ripley.dm

@@ -45,16 +45,6 @@
 	..()
 	update_icon()
 
-/obj/mecha/working/ripley/update_icon()
-	..()
-	var/datum/component/armor_plate/C = GetComponent(/datum/component/armor_plate)
-	if (C.amount)
-		cut_overlays()
-		if(C.amount < 3)
-			add_overlay(occupant ? "ripley-g" : "ripley-g-open")
-		else
-			add_overlay(occupant ? "ripley-g-full" : "ripley-g-full-open")
-
 /obj/mecha/working/ripley/Initialize()
 	. = ..()
 	AddComponent(/datum/component/armor_plate,3,/obj/item/stack/sheet/animalhide/goliath_hide,list("melee" = 10, "bullet" = 5, "laser" = 5))

code/game/objects/effects/landmarks.dm

@@ -151,6 +151,10 @@ INITIALIZE_IMMEDIATE(/obj/effect/landmark)
 	name = "Medical Doctor"
 	icon_state = "Medical Doctor"
 
+/obj/effect/landmark/start/paramedic
+	name = "Paramedic"
+	icon_state = "Paramedic"
+
 /obj/effect/landmark/start/scientist
 	name = "Scientist"
 	icon_state = "Scientist"
@@ -502,8 +506,3 @@ INITIALIZE_IMMEDIATE(/obj/effect/landmark/start/new_player)
 /obj/effect/landmark/stationroom/box/engine/New()
 	. = ..()
 	templates = CONFIG_GET(keyed_list/box_random_engine)
-
-// Landmark for the mining station
-/obj/effect/landmark/stationroom/lavaland/station
-	templates = list("Public Mining Base" = 3)
-	icon = 'icons/rooms/Lavaland/Mining.dmi'

code/game/objects/effects/temporary_visuals/miscellaneous.dm

@@ -139,13 +139,6 @@
 /obj/effect/temp_visual/dir_setting/curse/hand
 	icon_state = "cursehand"
 
-/obj/effect/temp_visual/dir_setting/curse/hand/Initialize(mapload, set_dir, handedness)
-	. = ..()
-	update_icon()
-
-/obj/item/projectile/curse_hand/update_icon()
-	icon_state = "[icon_state][handedness]"
-
 /obj/effect/temp_visual/wizard
 	name = "water"
 	icon = 'icons/mob/mob.dmi'
@@ -474,7 +467,7 @@
 	else
 		update_icon()
 
-/obj/effect/constructing_effect/update_icon()
+/obj/effect/constructing_effect/update_icon_state()
 	icon_state = "rcd"
 	if (delay < 10)
 		icon_state += "_shortest"

code/game/objects/items.dm

@@ -68,7 +68,6 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 	var/equip_delay_other = 20 //In deciseconds, how long an item takes to put on another person
 	var/strip_delay = 40 //In deciseconds, how long an item takes to remove from another person
 	var/breakouttime = 0
-	var/list/materials
 	var/reskinned = FALSE
 
 	var/list/attack_verb //Used in attackby() to say how something was attacked "[x] has been [z.attack_verb] by [y] with [z]"
@@ -112,8 +111,6 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 
 /obj/item/Initialize()
 
-	materials =	typelist("materials", materials)
-
 	if (attack_verb)
 		attack_verb = typelist("attack_verb", attack_verb)
 
@@ -233,9 +230,9 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 
 	// Extractable materials. Only shows the names, not the amounts.
 	research_msg += ".<br><font color='purple'>Extractable materials:</font> "
-	if (materials.len)
+	if (length(custom_materials))
 		sep = ""
-		for(var/mat in materials)
+		for(var/mat in custom_materials)
 			research_msg += sep
 			research_msg += CallMaterialName(mat)
 			sep = ", "

code/game/objects/items/AI_modules.dm

@@ -22,7 +22,7 @@ AI MODULES
 	throw_range = 7
 	var/list/laws = list()
 	var/bypass_law_amt_check = 0
-	materials = list(MAT_GOLD=50)
+	custom_materials = list(/datum/material/gold=50)
 
 /obj/item/aiModule/examine(var/mob/user as mob)
 	. = ..()
@@ -369,7 +369,7 @@ AI MODULES
 	if(!targName)
 		return
 	subject = targName
-	laws = list("You may not injure a [subject] or, through inaction, allow a [subject] to come to harm.",\
+	laws = list("You may not injure a [subject] or cause one to come to harm.",\
 				"You must obey orders given to you by [subject]s, except where such orders would conflict with the First Law.",\
 				"You must protect your own existence as long as such does not conflict with the First or Second Law.")
 	..()

code/game/objects/items/RCD.dm

@@ -22,7 +22,7 @@ RLD
 	throw_speed = 3
 	throw_range = 5
 	w_class = WEIGHT_CLASS_NORMAL
-	materials = list(MAT_METAL=100000)
+	custom_materials = list(/datum/material/iron=100000)
 	req_access_txt = "11"
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 100, "acid" = 50)
 	resistance_flags = FIRE_PROOF
@@ -552,8 +552,8 @@ RLD
 	explosion(src, 0, 0, 3, 1, flame_range = 1)
 	qdel(src)
 
-/obj/item/construction/rcd/update_icon()
-	..()
+/obj/item/construction/rcd/update_overlays()
+	. = ..()
 	if(has_ammobar)
 		var/ratio = CEILING((matter / max_matter) * ammo_sections, 1)
 		cut_overlays()	//To prevent infinite stacking of overlays
@@ -603,7 +603,7 @@ RLD
 	energyfactor = 66
 
 /obj/item/construction/rcd/loaded
-	materials = list(MAT_METAL=48000, MAT_GLASS=32000)
+	custom_materials = list(/datum/material/iron = 48000, /datum/material/glass = 32000)
 	matter = 160
 
 /obj/item/construction/rcd/loaded/upgraded
@@ -635,13 +635,13 @@ RLD
 	item_state = "rcdammo"
 	lefthand_file = 'icons/mob/inhands/equipment/tools_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/tools_righthand.dmi'
-	materials = list(MAT_METAL=12000, MAT_GLASS=8000)
+	custom_materials = list(/datum/material/iron=12000, /datum/material/glass=8000)
 	var/ammoamt = 40
 
 /obj/item/rcd_ammo/large
 	name = "large compressed matter cartridge"
 	desc = "Highly compressed matter for the RCD. Has four times the matter packed into the same space as a normal cartridge."
-	materials = list(MAT_METAL=48000, MAT_GLASS=32000)
+	custom_materials = list(/datum/material/iron=48000, /datum/material/glass=32000)
 	ammoamt = 160
 
 
@@ -707,11 +707,10 @@ RLD
 	else
 		..()
 
-/obj/item/construction/rld/update_icon()
-	..()
+/obj/item/construction/rld/update_overlays()
+	. = ..()
 	var/ratio = CEILING((matter / max_matter) * ammo_sections, 1)
-	cut_overlays()	//To prevent infinite stacking of overlays
-	add_overlay("rld_light[ratio]")
+	. += "rld_light[ratio]"
 
 /obj/item/construction/rld/attack_self(mob/user)
 	..()

code/game/objects/items/RCL.dm

@@ -23,6 +23,10 @@
 	var/datum/radial_menu/persistent/wiring_gui_menu
 	var/mob/listeningTo
 
+/obj/item/twohanded/rcl/ComponentInitialize()
+	. = ..()
+	AddElement(/datum/element/update_icon_updates_onmob)
+
 /obj/item/twohanded/rcl/attackby(obj/item/W, mob/user)
 	if(istype(W, /obj/item/stack/cable_coil))
 		var/obj/item/stack/cable_coil/C = W
@@ -90,34 +94,20 @@
 	QDEL_NULL(wiring_gui_menu)
 	return ..()
 
-/obj/item/twohanded/rcl/update_icon()
-	if(!loaded)
-		icon_state = "rcl-empty"
-		item_state = "rcl-empty"
+/obj/item/twohanded/rcl/update_icon_state()
+	icon_state = initial(icon_state)
+	item_state = initial(item_state)
+	if(!loaded || !loaded.amount)
+		icon_state += "-empty"
+		item_state += "-0"
+
+/obj/item/twohanded/rcl/update_overlays()
+	. = ..()
+	if(!loaded || !loaded.amount)
 		return
-	cut_overlays()
-	var/cable_amount = 0
-	switch(loaded.amount)
-		if(61 to INFINITY)
-			cable_amount = 3
-		if(31 to 60)
-			cable_amount = 2
-		if(1 to 30)
-			cable_amount = 1
-		else
-			cable_amount = 0
-
-	var/mutable_appearance/cable_overlay = mutable_appearance(icon, "rcl-[cable_amount]")
+	var/mutable_appearance/cable_overlay = mutable_appearance(icon, "rcl-[max(CEILING(loaded.amount/(max_amount/3), 1), 3)]")
 	cable_overlay.color = GLOB.cable_colors[colors[current_color_index]]
-	if(cable_amount >= 1)
-		icon_state = "rcl"
-		item_state = "rcl"
-		add_overlay(cable_overlay)
-	else
-		icon_state = "rcl-empty"
-		item_state = "rcl-0"
-		add_overlay(cable_overlay)
-
+	. += cable_overlay
 
 /obj/item/twohanded/rcl/proc/is_empty(mob/user, loud = 1)
 	update_icon()
@@ -323,33 +313,6 @@ obj/item/twohanded/rcl/proc/getMobhook(mob/to_hook)
 	actions_types = list()
 	max_amount = 30
 	name = "makeshift rapid cable layer"
+	icon_state = "rclg"
+	item_state = "rclg"
 	ghetto = TRUE
-
-/obj/item/twohanded/rcl/ghetto/update_icon()
-	if(!loaded)
-		icon_state = "rclg-empty"
-		item_state = "rclg-0"
-		return
-	cut_overlays()
-	var/cable_amount = 0
-	switch(loaded.amount)
-		if(20 to INFINITY)
-			cable_amount = 3
-		if(10 to 19)
-			cable_amount = 2
-		if(1 to 9)
-			cable_amount = 1
-		else
-			cable_amount = 0
-
-	var/mutable_appearance/cable_overlay = mutable_appearance(icon, "rcl-[cable_amount]")
-	cable_overlay.color = GLOB.cable_colors[colors[current_color_index]]
-	if(cable_amount >= 1)
-		icon_state = "rclg"
-		item_state = "rclg"
-		add_overlay(cable_overlay)
-	else
-		icon_state = "rclg-empty"
-		item_state = "rclg-0"
-		add_overlay(cable_overlay)
-

code/game/objects/items/RPD.dm

@@ -188,7 +188,7 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	throw_speed = 1
 	throw_range = 5
 	w_class = WEIGHT_CLASS_NORMAL
-	materials = list(MAT_METAL=75000, MAT_GLASS=37500)
+	custom_materials = list(/datum/material/iron=75000, /datum/material/glass=37500)
 	armor = list("melee" = 0, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 100, "acid" = 50)
 	resistance_flags = FIRE_PROOF
 	var/datum/effect_system/spark_spread/spark_system

code/game/objects/items/airlock_painter.dm

@@ -7,7 +7,7 @@
 
 	w_class = WEIGHT_CLASS_SMALL
 
-	materials = list(MAT_METAL=50, MAT_GLASS=50)
+	custom_materials = list(/datum/material/iron=50, /datum/material/glass=50)
 
 	flags_1 = CONDUCT_1
 	item_flags = NOBLUDGEON

code/game/objects/items/apc_frame.dm

@@ -1,6 +1,6 @@
 /obj/item/wallframe
 	icon = 'icons/obj/wallframe.dmi'
-	materials = list(MAT_METAL=MINERAL_MATERIAL_AMOUNT*2)
+	custom_materials = list(/datum/material/iron=MINERAL_MATERIAL_AMOUNT*2)
 	flags_1 = CONDUCT_1
 	item_state = "syringe_kit"
 	lefthand_file = 'icons/mob/inhands/equipment/medical_lefthand.dmi'
@@ -66,8 +66,8 @@
 		if(iswallturf(T))
 			T.attackby(src, user, params)
 
-	var/metal_amt = round(materials[MAT_METAL]/MINERAL_MATERIAL_AMOUNT)
-	var/glass_amt = round(materials[MAT_GLASS]/MINERAL_MATERIAL_AMOUNT)
+	var/metal_amt = round(custom_materials[getmaterialref(/datum/material/iron)]/MINERAL_MATERIAL_AMOUNT)
+	var/glass_amt = round(custom_materials[getmaterialref(/datum/material/glass)]/MINERAL_MATERIAL_AMOUNT)
 
 	if(istype(W, /obj/item/wrench) && (metal_amt || glass_amt))
 		to_chat(user, "<span class='notice'>You dismantle [src].</span>")
@@ -119,5 +119,5 @@
 	righthand_file = 'icons/mob/inhands/misc/devices_righthand.dmi'
 	flags_1 = CONDUCT_1
 	w_class = WEIGHT_CLASS_SMALL
-	materials = list(MAT_METAL=50, MAT_GLASS=50)
+	custom_materials = list(/datum/material/iron=50, /datum/material/glass=50)
 	grind_results = list(/datum/reagent/iron = 10, /datum/reagent/silicon = 10)

code/game/objects/items/balls.dm

@@ -20,7 +20,7 @@
 	throw_range = 14
 	w_class = WEIGHT_CLASS_SMALL
 
-/obj/item/toy/tennis/pre_altattackby(atom/A, mob/living/user, params)	//checks if it can do right click memes
+/obj/item/toy/tennis/alt_pre_attack(atom/A, mob/living/user, params)	//checks if it can do right click memes
 	altafterattack(A, user, TRUE, params)
 	return TRUE
 

code/game/objects/items/boombox.dm

@@ -37,7 +37,7 @@
 	SSjukeboxes.removejukebox(SSjukeboxes.findjukeboxindex(src))
 	. = ..()
 
-/obj/item/boombox/update_icon()
+/obj/item/boombox/update_icon_state()
 	icon_state = "[baseiconstate]_[boomingandboxing ? "on" : "off"]"
 	return
 
@@ -48,8 +48,11 @@
 	baseiconstate = "raiqbawks"
 	availabletrackids = list("hotline.ogg","chiptune.ogg","genesis.ogg")
 
-/obj/item/boombox/raiq/update_icon()
+/obj/item/boombox/raiq/Initialize()
 	. = ..()
+	RegisterSignal(src, COMSIG_ATOM_UPDATED_ICON, .proc/start_party)
+
+/obj/item/boombox/raiq/proc/start_party()
 	if(boomingandboxing)
 		START_PROCESSING(SSobj, src)
 	else
@@ -58,4 +61,3 @@
 
 /obj/item/boombox/raiq/process()
 	set_light(5,0.95,pick("#d87aff","#7a7aff","#89ecff","#b88eff","#ff59ad"))
-	return

code/game/objects/items/candle.dm

@@ -19,7 +19,7 @@
 	if(start_lit)
 		light()
 
-/obj/item/candle/update_icon()
+/obj/item/candle/update_icon_state()
 	icon_state = "candle[(wax > 400) ? ((wax > 750) ? 1 : 2) : 3][lit ? "_lit" : ""]"
 
 /obj/item/candle/attackby(obj/item/W, mob/user, params)

code/game/objects/items/cards_ids.dm

@@ -40,13 +40,13 @@
 	.=..()
 	update_icon()
 
-/obj/item/card/data/update_icon()
-	cut_overlays()
+/obj/item/card/data/update_overlays()
+	. = ..()
 	if(detail_color == COLOR_FLOORTILE_GRAY)
 		return
 	var/mutable_appearance/detail_overlay = mutable_appearance('icons/obj/card.dmi', "[icon_state]-color")
 	detail_overlay.color = detail_color
-	add_overlay(detail_overlay)
+	. += detail_overlay
 
 /obj/item/card/data/attackby(obj/item/I, mob/living/user)
 	if(istype(I, /obj/item/integrated_electronics/detailer))
@@ -517,10 +517,16 @@ update_label("John Doe", "Clowny")
 //Polychromatic Knight Badge
 
 /obj/item/card/id/knight
-	var/id_color = "#00FF00" //defaults to green
 	name = "knight badge"
 	icon_state = "knight"
 	desc = "A badge denoting the owner as a knight! It has a strip for swiping like an ID"
+	var/id_color = "#00FF00" //defaults to green
+	var/mutable_appearance/id_overlay
+
+/obj/item/card/id/knight/Initialize()
+	. = ..()
+	id_overlay = mutable_appearance(icon, "knight_overlay")
+	update_icon()
 
 /obj/item/card/id/knight/update_label(newname, newjob)
 	if(newname || newjob)
@@ -529,14 +535,10 @@ update_label("John Doe", "Clowny")
 
 	name = "[(!registered_name)	? "knight badge"	: "[registered_name]'s Knight Badge"][(!assignment) ? "" : " ([assignment])"]"
 
-/obj/item/card/id/knight/update_icon()
-	var/mutable_appearance/id_overlay = mutable_appearance(icon, "knight_overlay")
-
-	if(id_color)
-		id_overlay.color = id_color
-	cut_overlays()
-
-	add_overlay(id_overlay)
+/obj/item/card/id/knight/update_overlays()
+	. = ..()
+	id_overlay.color = id_color
+	. += id_overlay
 
 /obj/item/card/id/knight/AltClick(mob/living/user)
 	. = ..()
@@ -556,10 +558,6 @@ update_label("John Doe", "Clowny")
 		update_icon()
 		return TRUE
 
-/obj/item/card/id/knight/Initialize()
-	. = ..()
-	update_icon()
-
 /obj/item/card/id/knight/examine(mob/user)
 	. = ..()
 	. += "<span class='notice'>Alt-click to recolor it.</span>"

code/game/objects/items/chrono_eraser.dm

@@ -65,8 +65,9 @@
 		TED = new(src.loc)
 		return INITIALIZE_HINT_QDEL
 
-/obj/item/gun/energy/chrono_gun/update_icon()
-	return
+/obj/item/gun/energy/chrono_gun/ComponentInitialize()
+	. = ..()
+	AddElement(/datum/element/update_icon_blocker)
 
 /obj/item/gun/energy/chrono_gun/process_fire(atom/target, mob/living/user, message = TRUE, params = null, zone_override = "", bonus_spread = 0)
 	if(field)

code/game/objects/items/cigs_lighters.dm

@@ -522,11 +522,13 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 		user.visible_message("<span class='suicide'>[user] begins whacking [user.p_them()]self with \the [src]! It looks like [user.p_theyre()] trying to commit suicide!</span>")
 		return BRUTELOSS
 
-/obj/item/lighter/update_icon()
-	cut_overlays()
-	var/mutable_appearance/lighter_overlay = mutable_appearance(icon,"lighter_overlay_[overlay_state][lit ? "-on" : ""]")
+/obj/item/lighter/update_icon_state()
 	icon_state = "[initial(icon_state)][lit ? "-on" : ""]"
-	add_overlay(lighter_overlay)
+
+/obj/item/lighter/update_overlays()
+	. = ..()
+	var/mutable_appearance/lighter_overlay = mutable_appearance(icon,"lighter_overlay_[overlay_state][lit ? "-on" : ""]")
+	. += lighter_overlay
 
 /obj/item/lighter/ignition_effect(atom/A, mob/user)
 	if(get_temperature())
@@ -645,12 +647,14 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 		lighter_color = pick(color_list)
 	update_icon()
 
-/obj/item/lighter/greyscale/update_icon()
-	cut_overlays()
-	var/mutable_appearance/lighter_overlay = mutable_appearance(icon,"lighter_overlay_[overlay_state][lit ? "-on" : ""]")
+/obj/item/lighter/greyscale/update_icon_state()
 	icon_state = "[initial(icon_state)][lit ? "-on" : ""]"
+
+/obj/item/lighter/greyscale/update_overlays()
+	. = ..()
+	var/mutable_appearance/lighter_overlay = mutable_appearance(icon,"lighter_overlay_[overlay_state][lit ? "-on" : ""]")
 	lighter_overlay.color = lighter_color
-	add_overlay(lighter_overlay)
+	. += lighter_overlay
 
 /obj/item/lighter/greyscale/ignition_effect(atom/A, mob/user)
 	if(get_temperature())

code/game/objects/items/circuitboards/circuitboard.dm

@@ -10,7 +10,7 @@
 	item_state = "electronic"
 	lefthand_file = 'icons/mob/inhands/misc/devices_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/misc/devices_righthand.dmi'
-	materials = list(MAT_GLASS=1000)
+	custom_materials = list(/datum/material/glass=1000)
 	w_class = WEIGHT_CLASS_SMALL
 	grind_results = list(/datum/reagent/silicon = 20)
 	var/build_path = null

code/game/objects/items/crayons.dm

@@ -577,8 +577,8 @@
 	new /obj/item/toy/crayon/black(src)
 	update_icon()
 
-/obj/item/storage/crayons/update_icon()
-	cut_overlays()
+/obj/item/storage/crayons/update_overlays()
+	. = ..()
 	for(var/obj/item/toy/crayon/crayon in contents)
 		add_overlay(mutable_appearance('icons/obj/crayons.dmi', crayon.item_color))
 
@@ -735,13 +735,15 @@
 
 	. = ..()
 
-/obj/item/toy/crayon/spraycan/update_icon()
+/obj/item/toy/crayon/spraycan/update_icon_state()
 	icon_state = is_capped ? icon_capped : icon_uncapped
+
+/obj/item/toy/crayon/spraycan/update_overlays()
+	. = ..()
 	if(use_overlays)
-		cut_overlays()
 		var/mutable_appearance/spray_overlay = mutable_appearance('icons/obj/crayons.dmi', "[is_capped ? "spraycan_cap_colors" : "spraycan_colors"]")
 		spray_overlay.color = paint_color
-		add_overlay(spray_overlay)
+		. += spray_overlay
 
 /obj/item/toy/crayon/spraycan/borg
 	name = "cyborg spraycan"

code/game/objects/items/defib.dm

@@ -20,7 +20,7 @@
 	var/safety = TRUE //if you can zap people with the defibs on harm mode
 	var/powered = FALSE //if there's a cell in the defib with enough power for a revive, blocks paddles from reviving otherwise
 	var/obj/item/twohanded/shockpaddles/paddles
-	var/obj/item/stock_parts/cell/high/cell
+	var/obj/item/stock_parts/cell/cell
 	var/combat = FALSE //can we revive through space suits?
 	var/grab_ghost = FALSE // Do we pull the ghost back into their body?
 	var/healdisk = FALSE // Will we shock people dragging the body?
@@ -35,19 +35,14 @@
 
 /obj/item/defibrillator/Initialize() //starts without a cell for rnd
 	. = ..()
+	if(cell)
+		cell = new cell(src)
 	paddles = make_paddles()
-	update_icon()
-	return
-
-/obj/item/defibrillator/loaded/Initialize() //starts with hicap
-	. = ..()
-	cell = new(src)
-	update_icon()
-	return
-
-/obj/item/defibrillator/update_icon()
 	update_power()
-	return ..()
+	return
+
+/obj/item/defibrillator/loaded
+	cell = /obj/item/stock_parts/cell/high
 
 /obj/item/defibrillator/proc/update_power()
 	if(!QDELETED(cell))
@@ -57,6 +52,7 @@
 			powered = TRUE
 	else
 		powered = FALSE
+	update_icon()
 
 /obj/item/defibrillator/update_overlays()
 	. = ..()
@@ -76,7 +72,7 @@
 /obj/item/defibrillator/CheckParts(list/parts_list)
 	..()
 	cell = locate(/obj/item/stock_parts/cell) in contents
-	update_icon()
+	update_power()
 
 /obj/item/defibrillator/ui_action_click()
 	toggle_paddles()
@@ -124,7 +120,7 @@
 				return
 			cell = W
 			to_chat(user, "<span class='notice'>You install a cell in [src].</span>")
-			update_icon()
+			update_power()
 
 	else if(istype(W, /obj/item/screwdriver))
 		if(cell)
@@ -132,7 +128,7 @@
 			cell.forceMove(get_turf(src))
 			cell = null
 			to_chat(user, "<span class='notice'>You remove the cell from [src].</span>")
-			update_icon()
+			update_power()
 	else
 		return ..()
 
@@ -157,7 +153,7 @@
 		safety = TRUE
 		visible_message("<span class='notice'>[src] beeps: Safety protocols enabled!</span>")
 		playsound(src, 'sound/machines/defib_saftyOn.ogg', 50, 0)
-	update_icon()
+	update_power()
 
 /obj/item/defibrillator/proc/toggle_paddles()
 	set name = "Toggle Paddles"
@@ -170,14 +166,14 @@
 		if(!usr.put_in_hands(paddles))
 			on = FALSE
 			to_chat(user, "<span class='warning'>You need a free hand to hold the paddles!</span>")
-			update_icon()
+			update_power()
 			return
 	else
 		//Remove from their hands and back onto the defib unit
 		paddles.unwield()
 		remove_paddles(user)
 
-	update_icon()
+	update_power()
 	for(var/X in actions)
 		var/datum/action/A = X
 		A.UpdateButtonIcon()
@@ -189,7 +185,7 @@
 	..()
 	if((slot_flags == ITEM_SLOT_BACK && slot != SLOT_BACK) || (slot_flags == ITEM_SLOT_BELT && slot != SLOT_BELT))
 		remove_paddles(user)
-		update_icon()
+		update_power()
 
 /obj/item/defibrillator/item_action_slot_check(slot, mob/user, datum/action/A)
 	if(slot == user.getBackSlot())
@@ -213,12 +209,12 @@
 	if(cell)
 		if(cell.charge < (paddles.revivecost+chrgdeductamt))
 			powered = FALSE
-			update_icon()
+			update_power()
 		if(cell.use(chrgdeductamt))
-			update_icon()
+			update_power()
 			return TRUE
 		else
-			update_icon()
+			update_power()
 			return FALSE
 
 /obj/item/defibrillator/proc/cooldowncheck(mob/user)
@@ -232,7 +228,7 @@
 				playsound(src, 'sound/machines/defib_failed.ogg', 50, 0)
 		paddles.cooldown = FALSE
 		paddles.update_icon()
-		update_icon()
+		update_power()
 
 /obj/item/defibrillator/compact
 	name = "compact defibrillator"
@@ -246,10 +242,8 @@
 	if(slot == user.getBeltSlot())
 		return TRUE
 
-/obj/item/defibrillator/compact/loaded/Initialize()
-	. = ..()
-	cell = new(src)
-	update_icon()
+/obj/item/defibrillator/compact/loaded
+	cell = /obj/item/stock_parts/cell/high
 
 /obj/item/defibrillator/compact/combat
 	name = "combat defibrillator"
@@ -258,17 +252,12 @@
 	safety = FALSE
 	always_emagged = TRUE
 	disarm_shock_time = 0
-
-/obj/item/defibrillator/compact/combat/loaded/Initialize()
-	. = ..()
-	cell = new /obj/item/stock_parts/cell/infinite(src)
-	update_icon()
+	cell = /obj/item/stock_parts/cell/infinite
 
 /obj/item/defibrillator/compact/combat/loaded/attackby(obj/item/W, mob/user, params)
 	if(W == paddles)
 		paddles.unwield()
 		toggle_paddles()
-		update_icon()
 		return
 
 //paddles
@@ -298,6 +287,10 @@
 
 	var/mob/listeningTo
 
+/obj/item/twohanded/shockpaddles/ComponentInitialize()
+	. = ..()
+	AddElement(/datum/element/update_icon_updates_onmob)
+
 /obj/item/twohanded/shockpaddles/equipped(mob/user, slot)
 	. = ..()
 	if(!req_defib)
@@ -339,14 +332,11 @@
 		busy = FALSE
 		update_icon()
 
-/obj/item/twohanded/shockpaddles/update_icon()
+/obj/item/twohanded/shockpaddles/update_icon_state()
 	icon_state = "defibpaddles[wielded]"
 	item_state = "defibpaddles[wielded]"
 	if(cooldown)
 		icon_state = "defibpaddles[wielded]_cooldown"
-	if(iscarbon(loc))
-		var/mob/living/carbon/C = loc
-		C.update_inv_hands()
 
 /obj/item/twohanded/shockpaddles/suicide_act(mob/user)
 	user.visible_message("<span class='danger'>[user] is putting the live paddles on [user.p_their()] chest! It looks like [user.p_theyre()] trying to commit suicide!</span>")
@@ -373,7 +363,7 @@
 		return
 	defib.on = FALSE
 	forceMove(defib)
-	defib.update_icon()
+	defib.update_power()
 
 /obj/item/twohanded/shockpaddles/proc/check_defib_exists(mainunit, mob/living/carbon/M, obj/O)
 	if(!req_defib)
@@ -431,26 +421,11 @@
 	if((!req_defib && grab_ghost) || (req_defib && defib.grab_ghost))
 		H.notify_ghost_cloning("Your heart is being defibrillated!")
 		H.grab_ghost() // Shove them back in their body.
-	else if(can_defib(H))
+	else if(H.can_defib())
 		H.notify_ghost_cloning("Your heart is being defibrillated. Re-enter your corpse if you want to be revived!", source = src)
 
 	do_help(H, user)
 
-/obj/item/twohanded/shockpaddles/proc/can_defib(mob/living/carbon/H) //Our code here is different than tg, if it breaks in testing; BUG_PROBABLE_CAUSE
-	var/obj/item/organ/heart = H.getorgan(/obj/item/organ/heart)
-	if(H.suiciding || H.hellbound || HAS_TRAIT(H, TRAIT_HUSK))
-		return
-	if((world.time - H.timeofdeath) > tlimit)
-		return
-	if((H.getBruteLoss() >= MAX_REVIVE_BRUTE_DAMAGE) || (H.getFireLoss() >= MAX_REVIVE_FIRE_DAMAGE))
-		return
-	if(!heart || (heart.organ_flags & ORGAN_FAILING))
-		return
-	var/obj/item/organ/brain/BR = H.getorgan(/obj/item/organ/brain)
-	if(QDELETED(BR) || BR.brain_death || (BR.organ_flags & ORGAN_FAILING) || H.suiciding)
-		return
-	return TRUE
-
 /obj/item/twohanded/shockpaddles/proc/shock_touching(dmg, mob/H)
 	if(!H.pulledby || !isliving(H.pulledby))
 		return
@@ -745,22 +720,22 @@
 	name = "Defibrillator Healing Disk"
 	desc = "An upgrade which increases the healing power of the defibrillator"
 	icon_state = "heal_disk"
-	materials = list(MAT_METAL=16000, MAT_GLASS = 18000, MAT_GOLD = 6000, MAT_SILVER = 6000)
+	custom_materials = list(/datum/material/iron=16000, /datum/material/glass = 18000, /datum/material/gold = 6000, /datum/material/silver = 6000)
 
 /obj/item/disk/medical/defib_shock
 	name = "Defibrillator Anti-Shock Disk"
 	desc = "A safety upgrade that guarantees only the patient will get shocked"
 	icon_state = "zap_disk"
-	materials = list(MAT_METAL=16000, MAT_GLASS = 18000, MAT_GOLD = 6000, MAT_SILVER = 6000)
+	custom_materials = list(/datum/material/iron=16000, /datum/material/glass = 18000, /datum/material/gold = 6000, /datum/material/silver = 6000)
 
 /obj/item/disk/medical/defib_decay
 	name = "Defibrillator Body-Decay Extender Disk"
 	desc = "An upgrade allowing the defibrillator to work on more decayed bodies"
 	icon_state = "body_disk"
-	materials = list(MAT_METAL=16000, MAT_GLASS = 18000, MAT_GOLD = 16000, MAT_SILVER = 6000, MAT_TITANIUM = 2000)
+	custom_materials = list(/datum/material/iron=16000, /datum/material/glass = 18000, /datum/material/gold = 16000, /datum/material/silver = 6000, /datum/material/titanium = 2000)
 
 /obj/item/disk/medical/defib_speed
 	name = "Defibrillator Fast Charge Disk"
 	desc = "An upgrade to the defibrillator capacitors, which let it charge faster"
 	icon_state = "fast_disk"
-	materials = list(MAT_METAL=16000, MAT_GLASS = 8000, MAT_GOLD = 26000, MAT_SILVER = 26000)
+	custom_materials = list(/datum/material/iron=16000, /datum/material/glass = 8000, /datum/material/gold = 26000, /datum/material/silver = 26000)

code/game/objects/items/devices/PDA/PDA.dm

@@ -41,6 +41,11 @@ GLOBAL_LIST_EMPTY(PDAs)
 	var/mode = 0 //Controls what menu the PDA will display. 0 is hub; the rest are either built in or based on cartridge.
 	var/list/overlays_icons = list('icons/obj/pda_alt.dmi' = list("pda-r", "screen_default", "id_overlay", "insert_overlay", "light_overlay", "pai_overlay"))
 	var/current_overlays = PDA_STANDARD_OVERLAYS
+
+	//variables exclusively used on 'update_overlays' (which should never be called directly, and 'update_icon' doesn't use args anyway)
+	var/new_overlays = FALSE
+	var/new_alert = FALSE
+
 	var/font_index = 0 //This int tells DM which font is currently selected and lets DM know when the last font has been selected so that it can cycle back to the first font when "toggle font" is pressed again.
 	var/font_mode = "font-family:monospace;" //The currently selected font.
 	var/background_color = "#808000" //The currently selected background color.
@@ -123,7 +128,8 @@ GLOBAL_LIST_EMPTY(PDAs)
 		inserted_item = new inserted_item(src)
 	else
 		inserted_item =	new /obj/item/pen(src)
-	update_icon(FALSE, TRUE)
+	new_overlays = TRUE
+	update_icon()
 
 /obj/item/pda/CtrlShiftClick(mob/living/user)
 	. = ..()
@@ -144,7 +150,8 @@ GLOBAL_LIST_EMPTY(PDAs)
 	if(QDELETED(src) || isnull(new_icon) || new_icon == icon || !M.canUseTopic(src, BE_CLOSE, FALSE, NO_TK))
 		return
 	icon = new_icon
-	update_icon(FALSE, TRUE)
+	new_overlays = TRUE
+	update_icon()
 	to_chat(M, "[src] is now skinned as '[choice]'.")
 
 /obj/item/pda/proc/set_new_overlays()
@@ -188,7 +195,8 @@ GLOBAL_LIST_EMPTY(PDAs)
 	var/pref_skin = GLOB.pda_reskins[C.prefs.pda_skin]
 	if(icon != pref_skin)
 		icon = pref_skin
-		update_icon(FALSE, TRUE)
+		new_overlays = TRUE
+		update_icon()
 	equipped = TRUE
 
 /obj/item/pda/proc/update_label()
@@ -215,25 +223,27 @@ GLOBAL_LIST_EMPTY(PDAs)
 		return TRUE
 	return FALSE
 
-/obj/item/pda/update_icon(alert = FALSE, new_overlays = FALSE)
+/obj/item/pda/update_overlays()
+	. = ..()
 	if(new_overlays)
 		set_new_overlays()
-	cut_overlays()
-	add_overlay(alert ? current_overlays[PDA_OVERLAY_ALERT] : current_overlays[PDA_OVERLAY_SCREEN])
+	. += new_alert ? current_overlays[PDA_OVERLAY_ALERT] : current_overlays[PDA_OVERLAY_SCREEN]
 	var/mutable_appearance/overlay = new()
 	overlay.pixel_x = overlays_x_offset
 	if(id)
 		overlay.icon_state = current_overlays[PDA_OVERLAY_ID]
-		add_overlay(new /mutable_appearance(overlay))
+		. += new /mutable_appearance(overlay)
 	if(inserted_item)
 		overlay.icon_state = current_overlays[PDA_OVERLAY_ITEM]
-		add_overlay(new /mutable_appearance(overlay))
+		. += new /mutable_appearance(overlay)
 	if(fon)
 		overlay.icon_state = current_overlays[PDA_OVERLAY_LIGHT]
-		add_overlay(new /mutable_appearance(overlay))
+		. += new /mutable_appearance(overlay)
 	if(pai)
 		overlay.icon_state = "[current_overlays[PDA_OVERLAY_PAI]][pai.pai ? "" : "_off"]"
-		add_overlay(new /mutable_appearance(overlay))
+		. += new /mutable_appearance(overlay)
+	new_overlays = FALSE
+	new_alert = FALSE
 
 /obj/item/pda/MouseDrop(mob/over, src_location, over_location)
 	var/mob/M = usr
@@ -849,6 +859,7 @@ GLOBAL_LIST_EMPTY(PDAs)
 
 		to_chat(L, "[icon2html(src)] <b>Message from [hrefstart][signal.data["name"]] ([signal.data["job"]])[hrefend], </b>[inbound_message] (<a href='byond://?src=[REF(src)];choice=Message;skiprefresh=1;target=[REF(signal.source)]'>Reply</a>) (<a href='byond://?src=[REF(src)];choice=toggle_block;target=[signal.data["name"]]'>BLOCK/UNBLOCK</a>)")
 
+	new_alert = TRUE
 	update_icon(TRUE)
 
 /obj/item/pda/proc/send_to_all(mob/living/U)

code/game/objects/items/devices/chameleonproj.dm

@@ -49,6 +49,10 @@
 		return
 	if(istype(target, /obj/structure/falsewall))
 		return
+	if(target.alpha != 255)
+		return
+	if(target.invisibility != 0)
+		return
 	if(iseffect(target))
 		if(!(istype(target, /obj/effect/decal))) //be a footprint
 			return

code/game/objects/items/devices/desynchronizer.dm

@@ -8,7 +8,7 @@
 	item_flags = NOBLUDGEON
 	lefthand_file = 'icons/mob/inhands/misc/devices_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/misc/devices_righthand.dmi'
-	materials = list(MAT_METAL = 250, MAT_GLASS = 500)
+	custom_materials = list(/datum/material/iron = 250, /datum/material/glass = 500)
 	var/max_duration = 3000
 	var/duration = 300
 	var/last_use = 0

code/game/objects/items/devices/doorCharge.dm

@@ -12,7 +12,7 @@
 	item_flags = NOBLUDGEON
 	force = 3
 	attack_verb = list("blown up", "exploded", "detonated")
-	materials = list(MAT_METAL=50, MAT_GLASS=30)
+	custom_materials = list(/datum/material/iron=50, /datum/material/glass=30)
 
 /obj/item/doorCharge/ex_act(severity, target)
 	switch(severity)

code/game/objects/items/devices/electroadaptive_pseudocircuit.dm

@@ -5,7 +5,7 @@
 	icon = 'icons/obj/module.dmi'
 	icon_state = "boris"
 	w_class = WEIGHT_CLASS_TINY
-	materials = list(MAT_METAL = 50, MAT_GLASS = 300)
+	custom_materials = list(/datum/material/iron = 50, /datum/material/glass = 300)
 	var/recharging = FALSE
 	var/circuits = 5 //How many circuits the pseudocircuit has left
 	var/static/recycleable_circuits = typecacheof(list(/obj/item/electronics/firelock, /obj/item/electronics/airalarm, /obj/item/electronics/firealarm, \