Borer removal, control, release of control, host death.

code/modules/mob/living/carbon/human/death.dm

@@ -54,6 +54,25 @@
 	dizziness = 0
 	jitteriness = 0
 
+	//Handle brain slugs.
+	var/datum/organ/external/head = get_organ("head")
+	var/mob/living/simple_animal/borer/B
+
+	for(var/I in head.implants)
+		if(istype(I,/mob/living/simple_animal/borer))
+			B = I
+	if(B)
+		if(!B.ckey && ckey && B.controlling)
+			B.ckey = ckey
+			B.controlling = 0
+		if(B.host_brain.ckey)
+			ckey = B.host_brain.ckey
+			B.host_brain.ckey = null
+			B.host_brain.name = "host brain"
+			B.host_brain.real_name = "host brain"
+
+		verbs -= /mob/living/carbon/human/proc/release_control
+
 	//Check for heist mode kill count.
 	if(ticker.mode && ( istype( ticker.mode,/datum/game_mode/heist) ) )
 		//Check for last assailant's mutantrace.

code/modules/mob/living/carbon/human/human.dm

@@ -1274,3 +1274,32 @@ mob/living/carbon/human/yank_out_object()
 		return 1
 	else
 		return 0
+
+//Brain slug proc for voluntary removal of control.
+/mob/living/carbon/human/proc/release_control()
+
+	set category = "Alien"
+	set name = "Release Control"
+	set desc = "Release control of your host's body."
+
+	var/datum/organ/external/head = get_organ("head")
+	var/mob/living/simple_animal/borer/B
+
+	for(var/I in head.implants)
+		if(istype(I,/mob/living/simple_animal/borer))
+			B = I
+	if(!B)
+		return
+
+	if(!B.ckey && ckey && B.controlling)
+		src << "\red <B>You withdraw your probosci, releasing control of [B.host_brain]</B>"
+		B.host_brain << "\red <B>Your vision swims as the alien parasite releases control of your body.</B>"
+		B.ckey = ckey
+		B.controlling = 0
+	if(B.host_brain.ckey)
+		ckey = B.host_brain.ckey
+		B.host_brain.ckey = null
+		B.host_brain.name = "host brain"
+		B.host_brain.real_name = "host brain"
+
+	verbs -= /mob/living/carbon/human/proc/release_control

code/modules/mob/screen.dm

@@ -606,6 +606,32 @@
 
 	var/mob/living/L = usr
 
+	//Resisting control by an alien mind.
+	if(istype(src.loc,/mob/living/simple_animal/borer))
+		var/mob/living/simple_animal/borer/B = src.loc
+		var/mob/living/captive_brain/H = src
+
+		H << "\red <B>You begin doggedly resisting the parasite's control.</B>"
+		B.host << "\red <B>You feel the captive mind of [src] begin to resist your control.</B>"
+
+		spawn(50)
+
+			if(!B || !H || !H.ckey)
+				return
+
+			H << "\red <B>With an immense exertion of will, you regain control of your body!</B>"
+			B.host << "\red <B>You feel control of the host brain ripped from your grasp, and retract your probosci before the wild neural impulses can damage you.</b>"
+			B.controlling = 0
+
+			B.ckey = B.host.ckey
+			B.host.ckey = H.ckey
+
+			H.ckey = null
+			H.name = "host brain"
+			H.real_name = "host brain"
+
+			return
+
 	//resisting grabs (as if it helps anyone...)
 	if ((!( L.stat ) && L.canmove && !( L.restrained() )))
 		var/resisting = 0

code/modules/surgery/implant.dm

@@ -166,7 +166,7 @@
 
 		if (affected.implants.len)
 
-			var/obj/item/weapon/obj = affected.implants[1]
+			var/obj/item/obj = affected.implants[1]
 
 			if(istype(obj,/obj/item/weapon/implant))
 				var/obj/item/weapon/implant/imp = obj
@@ -181,6 +181,11 @@
 				user.visible_message("\blue [user] takes something out of incision on [target]'s [affected.display_name] with \the [tool].", \
 				"\blue You take [obj] out of incision on [target]'s [affected.display_name]s with \the [tool]." )
 				affected.implants -= obj
+
+				//Handle possessive brain borers.
+				if(istype(obj,/mob/living/simple_animal/borer))
+					target.release_control()
+
 				obj.loc = get_turf(target)
 				if(istype(obj,/obj/item/weapon/implant))
 					var/obj/item/weapon/implant/imp = obj