diff --git a/code/datums/outfits/outfit_debug.dm b/code/datums/outfits/outfit_debug.dm
index 287c8ea45a4..908eafdb38a 100644
--- a/code/datums/outfits/outfit_debug.dm
+++ b/code/datums/outfits/outfit_debug.dm
@@ -194,8 +194,10 @@
 	desc = "A wonder of modern medicine. This tool functions as any other sort of surgery tool, and finishes in only a fraction of the time. Hey, how'd you get your hands on this, anyway?"
 	toolspeed = 0.01
 
-/obj/item/scalpel/laser/manager/debug/attack_self__legacy__attackchain(mob/user)
-	. = ..()
+/obj/item/scalpel/laser/manager/debug/activate_self(mob/user)
+	if(..())
+		return
+
 	toolspeed = toolspeed == 0.5 ? 0.01 : 0.5
 	to_chat(user, "[src] is now set to toolspeed [toolspeed]")
 	playsound(src, 'sound/effects/pop.ogg', 50, 0)		//Change the mode
diff --git a/code/game/objects/items/theft_items.dm b/code/game/objects/items/theft_items.dm
index 768458f1087..06c9849babd 100644
--- a/code/game/objects/items/theft_items.dm
+++ b/code/game/objects/items/theft_items.dm
@@ -1,8 +1,4 @@
 //Items for nuke theft, supermatter theft traitor objective
-
-
-// STEALING THE NUKE
-
 //the nuke core, base item
 /obj/item/nuke_core
 	name = "plutonium core"
@@ -12,6 +8,7 @@
 	inhand_icon_state = "plutoniumcore"
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | ACID_PROOF
 	flags_2 = RAD_NO_CONTAMINATE_2 //This is made from radioactive material so cannot really be contaminated
+	new_attack_chain = TRUE
 	var/cooldown = 0
 	var/pulseicon = "plutonium_core_pulse"
 	// Is this made from radioactive material or not.
@@ -26,16 +23,11 @@
 /obj/item/nuke_core/Destroy()
 	return ..()
 
-/obj/item/nuke_core/attackby__legacy__attackchain(obj/item/nuke_core_container/container, mob/user)
-	if(istype(container))
-		container.load(src, user)
-	else
-		return ..()
-
 /obj/item/nuke_core/suicide_act(mob/user)
 	user.visible_message("<span class='suicide'>[user] is rubbing [src] against [user.p_themselves()]! It looks like [user.p_theyre()] trying to commit suicide!</span>")
 	return TOXLOSS
 
+// MARK: Plutonium core
 /// The steal objective, so it doesnt mess with the SM sliver on pinpointers and objectives
 /obj/item/nuke_core/plutonium
 
@@ -52,22 +44,10 @@
 	inhand_icon_state = "syringe_kit"
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | ACID_PROOF //Don't want people trying to break it open with acid, then destroying the core.
 	var/obj/item/nuke_core/plutonium/core
+	new_attack_chain = TRUE
 	var/dented = FALSE
 	var/cracked = FALSE
 
-/obj/item/nuke_core_container/Destroy()
-	QDEL_NULL(core)
-	return ..()
-
-/obj/item/nuke_core_container/ex_act(severity)
-	switch(severity)
-		if(EXPLODE_DEVASTATE)
-			if(!cracked)
-				crack_open()
-		if(EXPLODE_HEAVY)
-			if(!dented)
-				dented = TRUE
-
 /obj/item/nuke_core_container/examine(mob/user)
 	. = ..()
 	if(cracked) // Cracked open.
@@ -75,7 +55,22 @@
 	else if(dented) // Not cracked, but dented.
 		. += "<span class='notice'>[src] looks dented. Perhaps a bigger explosion may break it.</span>"
 	else // Not cracked or dented.
-		. += "Fine print on the box reads \"Syndicate Field Operations secure core extraction container. Guaranteed thermite proof, assistant proof, and explosive resistant.\""
+		. += "<span class='notice'>Fine print on the box reads \"Syndicate Field Operations secure core extraction container. Guaranteed thermite proof, assistant proof, and explosive resistant.\"</span>"
+
+/obj/item/nuke_core_container/item_interaction(mob/living/user, obj/item/used, list/modifiers)
+	if(!istype(used, /obj/item/nuke_core/plutonium))
+		return ..()
+
+	var/obj/item/nuke_core/plutonium/core = used
+	if(cracked)
+		return ITEM_INTERACT_COMPLETE
+
+	if(!user.drop_item())
+		to_chat(user, "<span class='warning'>[core] is stuck to your hand!</span>")
+		return ITEM_INTERACT_COMPLETE
+
+	load(core, user)
+	return ITEM_INTERACT_COMPLETE
 
 /obj/item/nuke_core_container/attack_hand(mob/user)
 	if(cracked && core)
@@ -83,6 +78,17 @@
 	else
 		return ..()
 
+/obj/item/nuke_core_container/ex_act(severity)
+	switch(severity)
+		if(EXPLODE_DEVASTATE)
+			if(!cracked)
+				crack_open()
+		if(EXPLODE_HEAVY)
+			dented = TRUE
+
+/obj/item/nuke_core_container/Destroy()
+	QDEL_NULL(core)
+	return ..()
 
 /obj/item/nuke_core_container/proc/load(obj/item/nuke_core/plutonium/new_core, mob/user)
 	if(core || !istype(new_core) || cracked)
@@ -111,16 +117,6 @@
 		if(ismob(loc))
 			to_chat(loc, "<span class='warning'>[src] is permanently sealed, [core]'s radiation is contained.</span>")
 
-/obj/item/nuke_core_container/attackby__legacy__attackchain(obj/item/nuke_core/plutonium/core, mob/user)
-	if(!istype(core) || cracked)
-		return ..()
-
-	if(!user.drop_item())
-		to_chat(user, "<span class='warning'>[core] is stuck to your hand!</span>")
-		return
-	else
-		load(core, user)
-
 /obj/item/nuke_core_container/proc/crack_open()
 	visible_message("<span class='boldnotice'>[src] bursts open!</span>")
 	if(core)
@@ -145,8 +141,7 @@
 	<li>???</li>\
 	</ul>"
 
-// STEALING SUPERMATTER.
-
+// MARK: Supermatter sliver
 /obj/item/paper/guides/antag/supermatter_sliver
 	info = "How to safely extract a supermatter sliver:<br>\
 	<ul>\
@@ -188,39 +183,54 @@
 		return TRUE
 	return FALSE
 
-/obj/item/nuke_core/supermatter_sliver/attackby__legacy__attackchain(obj/item/I, mob/living/user, params)
-	if(istype(I, /obj/item/retractor/supermatter))
-		var/obj/item/retractor/supermatter/tongs = I
+/obj/item/nuke_core/supermatter_sliver/item_interaction(mob/living/user, obj/item/used, list/modifiers)
+	if(istype(used, /obj/item/retractor/supermatter))
+		var/obj/item/retractor/supermatter/tongs = used
 		if(tongs.sliver)
 			to_chat(user, "<span class='warning'>[tongs] are already holding a supermatter sliver!</span>")
-			return FALSE
+			return ITEM_INTERACT_COMPLETE
+
 		forceMove(tongs)
 		tongs.sliver = src
 		tongs.update_icon(UPDATE_ICON_STATE)
 		to_chat(user, "<span class='notice'>You carefully pick up [src] with [tongs].</span>")
-	else if(istype(I, /obj/item/scalpel/supermatter) || istype(I, /obj/item/nuke_core_container/supermatter) || HAS_TRAIT(I, TRAIT_SUPERMATTER_IMMUNE)) // we don't want it to dust
-		return
-	else
-		if(issilicon(user))
-			to_chat(user, "<span class='userdanger'>You try to touch [src] with one of your modules. Error!</span>")
-			radiation_pulse(user, 2000, GAMMA_RAD)
-			playsound(src, 'sound/effects/supermatter.ogg', 50, TRUE)
-			user.dust()
-			qdel(src)
-			return
-		to_chat(user, "<span class='danger'>As it touches [src], both [src] and [I] burst into dust!</span>")
-		radiation_pulse(user, 400, GAMMA_RAD)
+		return ITEM_INTERACT_COMPLETE
+
+	if(istype(used, /obj/item/scalpel/supermatter) || istype(used, /obj/item/nuke_core_container/supermatter)) // we don't want it to dust
+		return ITEM_INTERACT_COMPLETE
+
+	if(user.status_flags & GODMODE || HAS_TRAIT(user, TRAIT_SUPERMATTER_IMMUNE))
+		return ITEM_INTERACT_COMPLETE
+
+	if(issilicon(user))
+		to_chat(user, "<span class='userdanger'>You try to touch [src] with [used]. ERROR!</span>")
+		radiation_pulse(user, 2000, GAMMA_RAD)
 		playsound(src, 'sound/effects/supermatter.ogg', 50, TRUE)
-		qdel(I)
+		user.dust()
 		qdel(src)
-		return ..()
+		return ITEM_INTERACT_COMPLETE
+
+	// Don't poke it with no-drops!
+	if(!user.drop_item())
+		radiation_pulse(user, 2000, GAMMA_RAD)
+		to_chat(user, "<span class='userdanger'>As it touches [src], both [src] and [used] burst into dust. The resonance then consumes you as well!</span>")
+		user.dust()
+	else
+		to_chat(user, "<span class='danger'>As it touches [src], both [src] and [used] burst into dust!</span>")
+		radiation_pulse(user, 400, GAMMA_RAD)
+		qdel(used)
+	playsound(src, 'sound/effects/supermatter.ogg', 50, TRUE)
+	qdel(src)
+	return ITEM_INTERACT_COMPLETE
 
 /obj/item/nuke_core/supermatter_sliver/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
 	if(!isliving(hit_atom))
 		return ..()
+
 	var/mob/living/victim = hit_atom
 	if(victim.incorporeal_move || victim.status_flags & GODMODE || HAS_TRAIT(victim, TRAIT_SUPERMATTER_IMMUNE)) //try to keep this in sync with supermatter's consume fail conditions
 		return ..()
+
 	var/mob/user = throwingdatum?.get_thrower()
 	if(user)
 		add_attack_logs(user, victim, "[victim] consumed by [src] thrown by [user] ")
@@ -241,8 +251,10 @@
 	..()
 	if(HAS_TRAIT(user, TRAIT_SUPERMATTER_IMMUNE))
 		return TRUE //yay sliver throwing memes!
+
 	if(!isliving(user) || user.status_flags & GODMODE) //try to keep this in sync with supermatter's consume fail conditions
 		return FALSE
+
 	user.visible_message("<span class='danger'>[user] reaches out and tries to pick up [src]. [user.p_their()] body starts to glow and bursts into flames before flashing into dust!</span>",
 			"<span class='userdanger'>You reach for [src] with your hands. That was dumb.</span>",
 			"<span class='hear'>Everything suddenly goes silent.</span>")
@@ -262,6 +274,7 @@
 /obj/item/nuke_core_container/supermatter/load(obj/item/retractor/supermatter/I, mob/user)
 	if(!istype(I) || !I.sliver || sliver)
 		return
+
 	I.sliver.forceMove(src)
 	sliver = I.sliver
 	I.sliver = null
@@ -285,6 +298,7 @@
 /obj/item/nuke_core_container/supermatter/unload(obj/item/retractor/supermatter/I, mob/user)
 	if(!istype(I) || I.sliver)
 		return
+
 	sliver.forceMove(I)
 	I.sliver = sliver
 	sliver = null
@@ -292,21 +306,23 @@
 	icon_state = "core_container_cracked_empty"
 	to_chat(user, "<span class='notice'>You carefully pick up [I.sliver] with [I].</span>")
 
-/obj/item/nuke_core_container/supermatter/attackby__legacy__attackchain(obj/item/retractor/supermatter/tongs, mob/user)
-	if(istype(tongs))
-		if(cracked)
-			//lets take that shard out
-			unload(tongs, user)
-		else
-			//try to load shard into core
-			load(tongs, user)
-	else
+/obj/item/nuke_core_container/supermatter/item_interaction(mob/living/user, obj/item/used, list/modifiers)
+	if(!istype(used, /obj/item/retractor/supermatter))
 		return ..()
 
+	var/obj/item/retractor/supermatter/tongs = used
+	if(cracked)
+		unload(tongs, user)
+		return ITEM_INTERACT_COMPLETE
+
+	load(tongs, user)
+	return ITEM_INTERACT_COMPLETE
+
 /obj/item/nuke_core_container/supermatter/attack_hand(mob/user)
 	if(cracked && sliver) //What did we say about touching the shard...
-		if(!isliving(user) || user.status_flags & GODMODE)
+		if(!isliving(user) || user.status_flags & GODMODE || HAS_TRAIT(user, TRAIT_SUPERMATTER_IMMUNE))
 			return FALSE
+
 		user.visible_message("<span class='danger'>[user] reaches out and tries to pick up [sliver]. [user.p_their()] body starts to glow and bursts into flames before flashing into dust!</span>",
 				"<span class='userdanger'>You reach for [sliver] with your hands. That was dumb.</span>",
 				"<span class='italics'>Everything suddenly goes silent.</span>")
@@ -317,7 +333,6 @@
 		user.dust()
 		icon_state = "core_container_cracked_empty"
 		qdel(sliver)
-
 	else
 		return ..()
 
@@ -363,12 +378,14 @@
 /obj/item/retractor/supermatter/update_icon_state()
 	icon_state = "[initial(icon_state)][sliver ? "_loaded" : ""]"
 
-/obj/item/retractor/supermatter/afterattack__legacy__attackchain(atom/O, mob/user, proximity)
+/obj/item/retractor/supermatter/interact_with_atom(atom/target, mob/living/user, list/modifiers)
 	. = ..()
 	if(!sliver)
 		return
-	if(proximity && ismovable(O) && O != sliver)
-		Consume(O, user)
+
+	if(ismovable(target) && target != sliver)
+		Consume(target, user)
+		return ITEM_INTERACT_COMPLETE
 
 /obj/item/retractor/supermatter/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum) // no instakill supermatter javelins
 	if(sliver)
@@ -379,32 +396,47 @@
 	return ..()
 
 /obj/item/retractor/supermatter/proc/Consume(atom/movable/AM, mob/living/user)
+	if(istype(AM, /obj/item/nuke_core_container))
+		return
+
+	if(istype(AM, /obj/machinery/atmospherics/supermatter_crystal))
+		return
+
+	if(istype(AM, /obj/singularity))
+		return
+
 	if(ismob(AM))
 		if(!isliving(AM))
 			return
+
 		var/mob/living/victim = AM
-		if(victim.incorporeal_move || victim.status_flags & GODMODE) //try to keep this in sync with supermatter's consume fail conditions
+		if(victim.incorporeal_move || victim.status_flags & GODMODE || HAS_TRAIT(victim, TRAIT_SUPERMATTER_IMMUNE)) //try to keep this in sync with supermatter's consume fail conditions
 			return
+
 		victim.dust()
+		radiation_pulse(src, 2000, GAMMA_RAD)
 		message_admins("[src] has consumed [key_name_admin(victim)] [ADMIN_JMP(src)].")
 		investigate_log("has irradiated [key_name(victim)].", INVESTIGATE_SUPERMATTER)
-	else if(istype(AM, /obj/singularity))
-		return
-	else if(istype(AM, /obj/item/nuke_core_container))
-		return
-	else if(istype(AM, /obj/machinery/atmospherics/supermatter_crystal))
-		return
-	else
-		investigate_log("has consumed [AM].", INVESTIGATE_SUPERMATTER)
-		qdel(AM)
 
-	if(user)
-		add_attack_logs(user, AM, "[AM] and [user] consumed by melee attack with [src] by [user]")
-		user.visible_message("<span class='danger'>As [user] touches [AM] with [src], both flash into dust and silence fills the room...</span>",
-			"<span class='userdanger'>You touch [AM] with [src], and everything suddenly goes silent.\n[AM] and [sliver] flash into dust, and soon as you can register this, you do as well.</span>",
-			"<span class='hear'>Everything suddenly goes silent.</span>")
-		user.dust()
-	radiation_pulse(src, 2000, GAMMA_RAD)
 	playsound(src, 'sound/effects/supermatter.ogg', 50, TRUE)
+	investigate_log("has consumed [AM].", INVESTIGATE_SUPERMATTER)
+	qdel(AM)
+	if(user)
+		if(!(HAS_TRAIT(user, TRAIT_SUPERMATTER_IMMUNE) || user.status_flags & GODMODE))
+			add_attack_logs(user, AM, "[AM] and [user] consumed by melee attack with [src] by [user].")
+			user.visible_message(
+				"<span class='danger'>As [user] touches [AM] with [src], both flash into dust and silence fills the room...</span>",
+				"<span class='userdanger'>You touch [AM] with [src], and everything suddenly goes silent.\n[AM] and [sliver] flash into dust, and soon as you can register this, you do as well.</span>",
+				"<span class='hear'>Everything suddenly goes silent.</span>"
+			)
+			user.dust()
+			radiation_pulse(src, 2000, GAMMA_RAD)
+		else
+			add_attack_logs(user, AM, "[AM] consumed by melee attack with [src] by [user].")
+			user.visible_message(
+				"<span class='danger'>As [user] touches [AM] with [src], [AM] flashes into dust and silence fills the room...</span>",
+				"<span class='userdanger'>You touch [AM] with [src], and everything suddenly goes silent.\n[AM] and [sliver] flash into dust.</span>",
+				"<span class='hear'>Everything suddenly goes silent.</span>"
+			)
 	QDEL_NULL(sliver)
 	update_icon(UPDATE_ICON_STATE)
diff --git a/code/modules/surgery/tools.dm b/code/modules/surgery/tools.dm
index 115733ed3f3..a3c301bd377 100644
--- a/code/modules/surgery/tools.dm
+++ b/code/modules/surgery/tools.dm
@@ -10,6 +10,7 @@
 	w_class = WEIGHT_CLASS_SMALL
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_RETRACTOR
+	new_attack_chain = TRUE
 
 /obj/item/retractor/Initialize(mapload)
 	. = ..()
@@ -35,6 +36,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("attacked", "pinched")
 	tool_behaviour = TOOL_HEMOSTAT
+	new_attack_chain = TRUE
 
 /obj/item/hemostat/Initialize(mapload)
 	. = ..()
@@ -60,6 +62,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("burnt")
 	tool_behaviour = TOOL_CAUTERY
+	new_attack_chain = TRUE
 
 /obj/item/cautery/Initialize(mapload)
 	. = ..()
@@ -67,9 +70,11 @@
 	RegisterSignal(src, COMSIG_BIT_ATTACH, PROC_REF(add_bit))
 	RegisterSignal(src, COMSIG_CLICK_ALT, PROC_REF(remove_bit))
 
-/obj/item/cautery/attack__legacy__attackchain(mob/living/target, mob/living/user)
-	if(!cigarette_lighter_act(user, target))
-		return ..()
+/obj/item/cautery/interact_with_atom(atom/target, mob/living/user, list/modifiers)
+	if(cigarette_lighter_act(user, target))
+		return ITEM_INTERACT_COMPLETE
+
+	return ..()
 
 /obj/item/cautery/cigarette_lighter_act(mob/living/user, mob/living/target, obj/item/direct_attackby_item)
 	var/obj/item/clothing/mask/cigarette/cig = ..()
@@ -108,6 +113,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("drilled")
 	tool_behaviour = TOOL_DRILL
+	new_attack_chain = TRUE
 
 /obj/item/surgicaldrill/Initialize(mapload)
 	. = ..()
@@ -146,6 +152,7 @@
 	attack_verb = list("attacked", "slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	tool_behaviour = TOOL_SCALPEL
+	new_attack_chain = TRUE
 
 /obj/item/scalpel/Initialize(mapload)
 	. = ..()
@@ -154,14 +161,12 @@
 	RegisterSignal(src, COMSIG_BIT_ATTACH, PROC_REF(add_bit))
 	RegisterSignal(src, COMSIG_CLICK_ALT, PROC_REF(remove_bit))
 
-
 /obj/item/scalpel/suicide_act(mob/user)
 	to_chat(viewers(user), pick("<span class='suicide'>[user] is slitting [user.p_their()] wrists with [src]! It looks like [user.p_theyre()] trying to commit suicide!</span>",
 						"<span class='suicide'>[user] is slitting [user.p_their()] throat with [src]! It looks like [user.p_theyre()] trying to commit suicide!</span>",
 						"<span class='suicide'>[user] is slitting [user.p_their()] stomach open with [src]! It looks like [user.p_theyre()] trying to commit seppuku!</span>"))
 	return BRUTELOSS
 
-
 /obj/item/scalpel/augment
 	desc = "Ultra-sharp blade attached directly to your bone for extra-accuracy."
 	toolspeed = 0.5
@@ -178,9 +183,11 @@
 	hitsound = 'sound/weapons/sear.ogg'
 	materials = list(MAT_METAL = 2000, MAT_GLASS = 1000)
 
-/obj/item/scalpel/laser/attack__legacy__attackchain(mob/living/carbon/target, mob/living/user)
-	if(!cigarette_lighter_act(user, target))
-		return ..()
+/obj/item/scalpel/laser/interact_with_atom(atom/target, mob/living/user, list/modifiers)
+	if(cigarette_lighter_act(user, target))
+		return ITEM_INTERACT_COMPLETE
+
+	return ..()
 
 /obj/item/scalpel/laser/cigarette_lighter_act(mob/living/user, mob/living/target, obj/item/direct_attackby_item)
 	var/obj/item/clothing/mask/cigarette/cig = ..()
@@ -246,6 +253,7 @@
 	origin_tech = "biotech=1;combat=1"
 	attack_verb = list("attacked", "slashed", "sawed", "cut")
 	tool_behaviour = TOOL_SAW
+	new_attack_chain = TRUE
 
 /obj/item/circular_saw/Initialize(mapload)
 	. = ..()
@@ -271,6 +279,7 @@
 	throwforce = 1.0
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_BONEGEL
+	new_attack_chain = TRUE
 
 /obj/item/bonegel/Initialize(mapload)
 	. = ..()
@@ -292,6 +301,7 @@
 	origin_tech = "materials=1;biotech=1"
 	w_class = WEIGHT_CLASS_SMALL
 	tool_behaviour = TOOL_FIXOVEIN
+	new_attack_chain = TRUE
 
 /obj/item/fix_o_vein/Initialize(mapload)
 	. = ..()
@@ -317,6 +327,7 @@
 	attack_verb = list("attacked", "hit", "bludgeoned")
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_BONESET
+	new_attack_chain = TRUE
 
 /obj/item/bonesetter/Initialize(mapload)
 	. = ..()
@@ -337,6 +348,7 @@
 	attack_verb = list("slapped")
 	/// How effective this is at preventing infections during surgeries.
 	var/surgery_effectiveness = 0.9
+	new_attack_chain = TRUE
 
 /obj/item/surgical_drapes/Initialize(mapload)
 	. = ..()