Replaces random disease with necrosis

code/modules/surgery/organs/organ.dm

@@ -66,7 +66,7 @@ var/list/organ_cache = list()
 			blood_DNA = list()
 		blood_DNA[dna.unique_enzymes] = dna.b_type
 
-/obj/item/organ/proc/die()
+/obj/item/organ/proc/necrotize(update_sprite=TRUE)
 	if(status & ORGAN_ROBOT)
 		return
 	damage = max_damage
@@ -105,10 +105,10 @@ var/list/organ_cache = list()
 		if(germ_level >= INFECTION_LEVEL_TWO)
 			germ_level += rand(2,6)
 		if(germ_level >= INFECTION_LEVEL_THREE)
-			die()
+			necrotize()
 
 		if(damage >= max_damage)
-			die()
+			necrotize()
 
 	else if(owner.bodytemperature >= 170)	//cryo stops germs from moving and doing their bad stuffs
 		//** Handle antibiotics and curing infections
@@ -117,7 +117,7 @@ var/list/organ_cache = list()
 
 	//check if we've hit max_damage
 	if(damage >= max_damage)
-		die()
+		necrotize()
 
 /obj/item/organ/proc/is_preserved()
 	if(istype(loc,/obj/item/device/mmi))

code/modules/surgery/organs/organ_external.dm

@@ -68,6 +68,19 @@
 	var/can_stand
 	var/wound_cleanup_timer
 
+/obj/item/organ/external/necrotize(update_sprite=TRUE)
+	if(status & (ORGAN_ROBOT|ORGAN_DEAD))
+		return
+	to_chat(owner, "<span class='notice'>You can't feel your [name] anymore...</span>")
+	status |= ORGAN_DEAD
+	if(dead_icon)
+		icon_state = dead_icon
+	if(owner)
+		owner.update_body(update_sprite)
+		owner.bad_external_organs |= src
+		if(vital)
+			owner.death()
+
 /obj/item/organ/external/Destroy()
 	if(parent && parent.children)
 		parent.children -= src
@@ -541,10 +554,7 @@ Note that amputating the affected organ does in fact remove the infection from t
 					parent.germ_level++
 
 	if(germ_level >= INFECTION_LEVEL_THREE && antibiotics < 30)	//overdosing is necessary to stop severe infections
-		if(!(status & ORGAN_DEAD))
-			status |= ORGAN_DEAD
-			to_chat(owner, "<span class='notice'>You can't feel your [name] anymore...</span>")
-			owner.update_body(1)
+		necrotize()
 
 		germ_level++
 		owner.adjustToxLoss(1)