Permanent Fat, Galbanic C, Macerinic S.

Added permanent fat, a new value that's added to your total fatness. It cannot be removed through normal means and persists between rounds. Its value is recorded when leaving through cryo or at the end of a round if one is alive.
Added Galbanic Compound, a fermichem that causes massive fatness gain and adds permanent fatness. Overdose increases these effects. Addiction causes you to still swell up with normal fat, makes you hungrier, less full and makes you gain more from all sources (these effects end when the addiction does).
Added Macerinic Solution, a fermichem that can quickly remove fat and even permanent fat.

GainStation13/code/mechanics/fatness.dm

@@ -11,6 +11,8 @@ GLOBAL_LIST_INIT(uncapped_resize_areas, list(/area/bridge, /area/crew_quarters,
 	var/fat_hiders = list()
 	//The actual value a mob is at. Is equal to fatness if fat_hider is FALSE.
 	var/fatness_real = 0
+	//Permanent fatness, which sticks around between rounds
+	var/fatness_perma = 0
 	///At what rate does the parent mob gain weight? 1 = 100%
 	var/weight_gain_rate = 1
 	//At what rate does the parent mob lose weight? 1 = 100%
@@ -46,7 +48,9 @@ GLOBAL_LIST_INIT(uncapped_resize_areas, list(/area/bridge, /area/crew_quarters,
 
 	fatness = fatness_real //Make their current fatness their real fatness
 
-	hiders_apply()	//Check and apply hiders, XWG is there too
+	hiders_apply()	//Check and apply hiders
+	perma_apply()	//Check and apply for permanent fat
+	xwg_resize()	//Apply XWG
 
 	return TRUE
 
@@ -132,24 +136,52 @@ GLOBAL_LIST_INIT(uncapped_resize_areas, list(/area/bridge, /area/crew_quarters,
 /mob/living/carbon/proc/hiders_apply()
 	if(fat_hiders) //do we have any hiders active?
 		var/fatness_over = hiders_calc() //calculate the sum of all hiders
+		fatness = fatness + fatness_over //Then, make their current fatness the sum of their real plus/minus the calculated amount
 		if(client?.prefs?.max_weight) //Check their prefs
-			fatness_over = min(fatness_over, (client?.prefs?.max_weight - 1)) //And make sure it's not above their preferred max
-		fatness = fatness_real + fatness_over //Then, make their current fatness the sum of their real plus/minus the calculated amount
-	if(client?.prefs?.weight_gain_extreme && !normalized)
-		xwg_resize()
+			fatness = min(fatness, (client?.prefs?.max_weight - 1)) //And make sure it's not above their preferred max
+
+/mob/living/carbon/proc/perma_apply()
+	if(fatness_perma > 0)	//Check if we need to make calcs at all
+		fatness = fatness + fatness_perma	//Add permanent fat to fatness
+		if(client?.prefs?.max_weight)	//Check for max weight prefs
+			fatness = min(fatness, (client?.prefs?.max_weight - 1))	//Apply max weight prefs
+
+/mob/living/carbon/proc/adjust_perma(adjustment_amount, type_of_fattening = FATTENING_TYPE_ITEM)
+	if(!adjustment_amount || !type_of_fattening)
+		return FALSE
+
+	if(!HAS_TRAIT(src, TRAIT_UNIVERSAL_GAINER) && client?.prefs)
+		if(!check_weight_prefs(type_of_fattening))
+			return FALSE
+	var/amount_to_change = adjustment_amount
+
+	if(adjustment_amount > 0)
+		amount_to_change = amount_to_change * weight_gain_rate	
+	else
+		amount_to_change = amount_to_change * weight_loss_rate
+
+	fatness_perma += amount_to_change
+	fatness_perma = max(fatness_perma, MINIMUM_FATNESS_LEVEL)
+		
+	if(client?.prefs?.max_weight) // GS13
+		fatness_perma = min(fatness_perma, (client?.prefs?.max_weight - 1))
 
 /mob/living/carbon/human/handle_breathing(times_fired)
 	. = ..()
+	fatness = fatness_real
 	hiders_apply()
+	perma_apply()
+	xwg_resize()
 
 /mob/living/carbon/proc/xwg_resize()
-	var/xwg_size = sqrt(fatness/FATNESS_LEVEL_BLOB)
-	xwg_size = min(xwg_size, RESIZE_MACRO)
-	xwg_size = max(xwg_size, custom_body_size*0.01)
-	if(xwg_size > RESIZE_BIG) //check if the size needs capping otherwise don't bother searching the list
-		if(!is_type_in_list(get_area(src), GLOB.uncapped_resize_areas)) //if the area is not int the uncapped whitelist and new size is over the cap
-			xwg_size = RESIZE_BIG
-	resize(xwg_size)
+	if(client?.prefs?.weight_gain_extreme && !normalized)
+		var/xwg_size = sqrt(fatness/FATNESS_LEVEL_BLOB)
+		xwg_size = min(xwg_size, RESIZE_MACRO)
+		xwg_size = max(xwg_size, custom_body_size*0.01)
+		if(xwg_size > RESIZE_BIG) //check if the size needs capping otherwise don't bother searching the list
+			if(!is_type_in_list(get_area(src), GLOB.uncapped_resize_areas)) //if the area is not int the uncapped whitelist and new size is over the cap
+				xwg_size = RESIZE_BIG
+		resize(xwg_size)
 
 /proc/get_fatness_level_name(fatness_amount)
 	if(fatness_amount < FATNESS_LEVEL_FAT)

GainStation13/code/mechanics/permanent_fat.dm

@@ -0,0 +1,18 @@
+/datum/preferences/proc/perma_fat_save(character)
+	if(iscarbon(character))
+		var/mob/living/carbon/C = character
+		if(!path)
+			return 0
+			if(world.time < savecharcooldown)
+				if(istype(parent))
+					to_chat(parent, "<span class='warning'>You're attempting to save your character a little too fast. Wait half a second, then try again.</span>")
+
+				return 0
+
+		savecharcooldown = world.time + PREF_SAVELOAD_COOLDOWN
+		var/savefile/S = new /savefile(path)
+		if(!S)
+			return 0
+		S.cd = "/character[default_slot]"
+		
+		WRITE_FILE(S["permanent_fat"]			, C.fatness_perma)

GainStation13/code/modules/reagents/chemistry/reagents/fermi_fat.dm

@@ -0,0 +1,186 @@
+///datum/reagent/sizechem
+
+//Reagent
+/datum/reagent/fermi_fat
+	name = "Galbanic Compound"
+	description = "A chemical compound derived from lipoifier. Massively increases adipose mass and parts of it become impossible to shed through normal means."
+	color = "#E70C0C"
+	taste_description = "hunger"
+	pH = 7
+	overdose_threshold = 50
+	metabolization_rate = REAGENTS_METABOLISM / 4
+	can_synth = FALSE //DO NOT MAKE THIS SNYTHESIZABLE, THESE CHEMS ARE SUPPOSED TO NOT BE USED COMMONLY
+
+	overdose_threshold = 50
+	addiction_threshold = 100
+	addiction_stage1_end = 10
+	addiction_stage2_end = 30
+	addiction_stage3_end = 60
+	addiction_stage4_end = 100
+
+	var/addiction_mults = 0
+
+//Reaction
+/datum/chemical_reaction/fermi_fat
+	name = "FermiFat"
+	id = /datum/reagent/fermi_fat
+	mix_message = "the reaction appears to swell!"
+	required_reagents = list(/datum/reagent/consumable/lipoifier = 0.1, /datum/reagent/medicine/pen_acid = 0.1, /datum/reagent/iron = 0.1)
+	results = list(/datum/reagent/fermi_fat = 0.2)
+	required_temp = 1
+	OptimalTempMin 		= 700		// Lower area of bell curve for determining heat based rate reactions
+	OptimalTempMax 		= 740		// Upper end for above
+	ExplodeTemp 		= 755 		// Temperature at which reaction explodes
+	OptimalpHMin 		= 2			// Lowest value of pH determining pH a 1 value for pH based rate reactions (Plateu phase)
+	OptimalpHMax 		= 3.5		// Higest value for above
+	ReactpHLim 			= 1 		// How far out pH wil react, giving impurity place (Exponential phase)
+	CatalystFact 		= 0 		// How much the catalyst affects the reaction (0 = no catalyst)
+	CurveSharpT 		= 4 		// How sharp the temperature exponential curve is (to the power of value)
+	CurveSharppH 		= 4 		// How sharp the pH exponential curve is (to the power of value)
+	ThermicConstant		= -10 		// Temperature change per 1u produced
+	HIonRelease 		= 0.02 		// pH change per 1u reaction (inverse for some reason)
+	RateUpLim 			= 2 		// Optimal/max rate possible if all conditions are perfect
+	FermiChem 			= TRUE		// If the chemical uses the Fermichem reaction mechanics
+	FermiExplode 		= FALSE		// If the chemical explodes in a special way
+	PurityMin 			= 0.1
+
+//When added
+/datum/reagent/fermi_fat/on_mob_add(mob/living/carbon/M)
+	. = ..()
+	if(iscarbon(M))
+		log_game("[M] ckey: [M.key] has ingested fermifat.")
+
+//Effects
+/datum/reagent/fermi_fat/on_mob_life(mob/living/carbon/M)
+	if(!iscarbon(M))
+		return..()
+	M.adjust_fatness(30, FATTENING_TYPE_CHEM)
+	M.adjust_perma(1, FATTENING_TYPE_CHEM)
+	..()
+	. = 1
+
+//While overdosed
+/datum/reagent/fermi_fat/overdose_process(mob/living/M)
+	if(!iscarbon(M))
+		return..()
+	var/mob/living/carbon/C = M
+	C.adjust_fatness(20, FATTENING_TYPE_CHEM)
+	C.adjust_perma(1, FATTENING_TYPE_CHEM)
+	..()
+
+/datum/reagent/fermi_fat/overdose_start(mob/living/M)
+	to_chat(M, "<span class='userdanger'>You took too much [name]! Your body is growing out of control!</span>")
+	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/overdose, name)
+	return
+
+/datum/reagent/fermi_fat/addiction_act_stage1(mob/living/M)
+	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_light, name)
+	if(prob(30))
+		var/add_text = pick("You feel pretty hungry.", "You think of [name].", "Your look around for food.", "[name] wasn't so bad.")
+		to_chat(M, "<span class='notice'>[add_text]</span>")
+	if(iscarbon(M))
+		var/mob/living/carbon/C = M
+		C.adjust_fatness(1, FATTENING_TYPE_CHEM)
+		C.fullness = max(0, C.fullness-1)
+		C.nutrition = max(0, C.nutrition-1)
+		if(addiction_mults == 0)
+			C.nutri_mult += 0.5
+			C.weight_gain_rate += 0.25
+			addiction_mults = 1
+	return
+
+/datum/reagent/fermi_fat/addiction_act_stage2(mob/living/M)
+	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_medium, name)
+	if(prob(30))
+		var/add_text = pick("You are very hungry.", "You could go for some [name].", "Your mouth waters.", "Is there any [name] around?")
+		to_chat(M, "<span class='notice'>[add_text]</span>")
+	if(iscarbon(M))
+		var/mob/living/carbon/C = M
+		C.adjust_fatness(2, FATTENING_TYPE_CHEM)
+		C.fullness = max(0, C.fullness-2)
+		C.nutrition = max(0, C.nutrition-2)
+		if(addiction_mults <= 1)
+			C.nutri_mult += 0.5
+			C.weight_gain_rate += 0.25
+			addiction_mults = 2
+	return
+
+/datum/reagent/fermi_fat/addiction_act_stage3(mob/living/M)
+	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_severe, name)
+	if(prob(30))
+		var/add_text = pick("You are starving!", "You need some [name]!", "Your stomach growls loudly!.", "You can't stop thinking about [name]")
+		to_chat(M, "<span class='danger'>[add_text]</span>")
+	if(iscarbon(M))
+		var/mob/living/carbon/C = M
+		C.adjust_fatness(3, FATTENING_TYPE_CHEM)
+		C.fullness = max(0, C.fullness-3)
+		C.nutrition = max(0, C.nutrition-3)
+		if(addiction_mults <= 2)
+			C.nutri_mult += 0.5
+			C.weight_gain_rate += 0.25
+			addiction_mults = 3
+	return
+
+/datum/reagent/fermi_fat/addiction_act_stage4(mob/living/M)
+	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_critical, name)
+	if(prob(30))
+		var/add_text = pick("You are ravenous!!", "You need [name] NOW!!", "You'd eat ANYTHING!!", "Where is the [name]?!", "Hungry, hungry, so HUNGRY!!", "More, you need more!!")
+		to_chat(M, "<span class='boldannounce'>[add_text]</span>")
+	if(iscarbon(M))
+		var/mob/living/carbon/C = M
+		C.adjust_fatness(4, FATTENING_TYPE_CHEM)
+		C.fullness = max(0, C.fullness-4)
+		C.nutrition = max(0, C.nutrition-4)
+		if(addiction_mults <= 3)
+			C.nutri_mult += 0.5
+			C.weight_gain_rate += 0.25
+			addiction_mults = 4
+	return
+
+/datum/reagent/fermi_fat/proc/addiction_remove(mob/living/carbon/C)
+	if(addiction_mults > 0)
+		C.nutri_mult = max(1, 0.5 * addiction_mults)
+		C.weight_gain_rate = max(0,11, 0.25 * addiction_mults)
+	return
+
+/datum/reagent/fermi_slim
+	name = "Macerinic Solution"
+	description = "A solution with unparalleled obesity-solving properties. One of the few things known to be capable of removing galbanic fat."
+	color = "#3b0ce7"
+	taste_description = "thinness"
+	pH = 7
+	metabolization_rate = REAGENTS_METABOLISM / 4
+	can_synth = FALSE
+
+//Reaction
+/datum/chemical_reaction/fermi_slim
+	name = "FermiSlim"
+	id = /datum/reagent/fermi_slim
+	mix_message = "the reaction seems to become thinner!"
+	required_reagents = list(/datum/reagent/medicine/lipolicide = 0.1, /datum/reagent/ammonia = 0.1, /datum/reagent/oxygen = 0.1)
+	results = list(/datum/reagent/fermi_slim = 0.2)
+	required_temp = 1
+	OptimalTempMin 		= 600		// Lower area of bell curve for determining heat based rate reactions
+	OptimalTempMax 		= 650		// Upper end for above
+	ExplodeTemp 		= 800 		// Temperature at which reaction explodes
+	OptimalpHMin 		= 10		// Lowest value of pH determining pH a 1 value for pH based rate reactions (Plateu phase)
+	OptimalpHMax 		= 11.5		// Higest value for above
+	ReactpHLim 			= 1 		// How far out pH wil react, giving impurity place (Exponential phase)
+	CatalystFact 		= 0 		// How much the catalyst affects the reaction (0 = no catalyst)
+	CurveSharpT 		= 4 		// How sharp the temperature exponential curve is (to the power of value)
+	CurveSharppH 		= 4 		// How sharp the pH exponential curve is (to the power of value)
+	ThermicConstant		= -10 		// Temperature change per 1u produced
+	HIonRelease 		= -0.02		// pH change per 1u reaction (inverse for some reason)
+	RateUpLim 			= 2 		// Optimal/max rate possible if all conditions are perfect
+	FermiChem 			= TRUE		// If the chemical uses the Fermichem reaction mechanics
+	FermiExplode 		= FALSE		// If the chemical explodes in a special way
+	PurityMin 			= 0.1
+
+//Effects
+/datum/reagent/fermi_slim/on_mob_life(mob/living/carbon/M)
+	if(!iscarbon(M))
+		return..()
+	M.adjust_fatness(-50, FATTENING_TYPE_CHEM)
+	M.adjust_perma(-5, FATTENING_TYPE_CHEM)
+	..()
+	. = 1

code/__HELPERS/roundend.dm

@@ -3,6 +3,13 @@
 #define POPCOUNT_SHUTTLE_ESCAPEES "shuttle_escapees" 	//Emergency shuttle only.
 
 /datum/controller/subsystem/ticker/proc/gather_roundend_feedback()
+
+	//GS13 Process permanent fat
+	for(var/mob/m in GLOB.player_list)
+		if(m.client.prefs)
+			if(m.client.ckey)
+				m.client.prefs.perma_fat_save(m)
+	
 	gather_antag_data()
 	record_nuke_disk_location()
 	var/json_file = file("[GLOB.log_directory]/round_end_data.json")

code/modules/client/preferences.dm

@@ -105,6 +105,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 
 	//GS13
 	var/starting_weight = 0				//how thicc you wanna be at start
+	var/permanent_fat = 0				//If it isn't the consequences of your own actions
 	var/wg_rate = 0.5
 	var/wl_rate = 0.5
 	var/voice = "human"
@@ -2997,6 +2998,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	//GS13
 	character.fatness = starting_weight
 	character.fatness_real = starting_weight
+	character.fatness_perma = permanent_fat
 	character.weight_gain_rate = wg_rate
 	character.weight_loss_rate = wl_rate
 

code/modules/client/preferences_savefile.dm

@@ -392,6 +392,7 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	S["age"]				>> age
 	S["body_size"]			>> body_size
 	S["starting_weight"]	>> starting_weight
+	S["permanent_fat"]		>> permanent_fat
 	S["wg_rate"]			>> wg_rate
 	S["wl_rate"]			>> wl_rate
 	S["hair_color"]			>> hair_color

code/modules/reagents/chemistry/holder.dm

@@ -321,6 +321,12 @@
 					else if(stage in R.addiction_stage4_end to INFINITY)
 						to_chat(C, "<span class='notice'>You feel like you've gotten over your need for [R.name].</span>")
 						SEND_SIGNAL(C, COMSIG_CLEAR_MOOD_EVENT, "[R.type]_addiction")
+						
+						//GS13 on reagent addiction removal
+						if(istype(R, /datum/reagent/fermi_fat))
+							var/datum/reagent/fermi_fat/F = R
+							F.addiction_remove(C)
+						
 						cached_addictions.Remove(R)
 					else
 						SEND_SIGNAL(C, COMSIG_CLEAR_MOOD_EVENT, "[R.type]_overdose")

modular_citadel/code/game/machinery/cryopod.dm

@@ -248,6 +248,11 @@
 /obj/machinery/cryopod/proc/despawn_occupant()
 	var/mob/living/mob_occupant = occupant
 
+	//GS13 Process permanent fat
+	if(mob_occupant.client.prefs)
+		if(mob_occupant.client.ckey)
+			mob_occupant.client.prefs.perma_fat_save(mob_occupant)
+
 	//Update any existing objectives involving this mob.
 	for(var/datum/objective/O in GLOB.objectives)
 		// We don't want revs to get objectives that aren't for heads of staff. Letting

tgstation.dme

@@ -3103,6 +3103,7 @@
 #include "GainStation13\code\mechanics\helplessness.dm"
 #include "GainStation13\code\mechanics\infestation.dm"
 #include "GainStation13\code\mechanics\metal_cruncher.dm"
+#include "GainStation13\code\mechanics\permanent_fat.dm"
 #include "GainStation13\code\mechanics\spells.dm"
 #include "GainStation13\code\mechanics\wand.dm"
 #include "GainStation13\code\mechanics\water_sponge.dm"
@@ -3133,6 +3134,7 @@
 #include "GainStation13\code\modules\reagents\chemistry\reagents\consumable_reagents.dm"
 #include "GainStation13\code\modules\reagents\chemistry\reagents\dwarverndrinks.dm"
 #include "GainStation13\code\modules\reagents\chemistry\reagents\fatty_drinks.dm"
+#include "GainStation13\code\modules\reagents\chemistry\reagents\fermi_fat.dm"
 #include "GainStation13\code\modules\reagents\chemistry\recipes\fatchem.dm"
 #include "GainStation13\code\modules\reagents\chemistry\recipes\fatdrinks.dm"
 #include "GainStation13\code\modules\reagents\chemistry\recipes\ROCKANDSTONEdrinks.dm"