I missed an earlier port.

code/modules/antagonists/abductor/equipment/gland.dm

@@ -151,7 +151,7 @@
 			if(2)
 				to_chat(H, "<span class='warning'>You hear an annoying buzz in your head.</span>")
 				H.confused += 15
-				H.adjustBrainLoss(10, 160)
+				H.adjustOrganLoss(ORGAN_SLOT_BRAIN, 10, 160)
 			if(3)
 				H.hallucination += 60
 

code/modules/antagonists/changeling/changeling.dm

@@ -83,7 +83,7 @@
 	if(istype(C))
 		var/obj/item/organ/brain/B = C.getorganslot(ORGAN_SLOT_BRAIN)
 		if(B && (B.decoy_override != initial(B.decoy_override)))
-			B.vital = TRUE
+			B.organ_flags |= ORGAN_VITAL
 			B.decoy_override = FALSE
 	remove_changeling_powers()
 	. = ..()

code/modules/antagonists/clockcult/clock_items/clockwork_armor.dm

@@ -50,7 +50,7 @@
 			to_chat(user, "<span class='userdanger'>The helmet tries to drive a spike through your head as you scramble to remove it!</span>")
 			user.emote("scream")
 			user.apply_damage(30, BRUTE, BODY_ZONE_HEAD)
-			user.adjustBrainLoss(30)
+			user.adjustOrganLoss(ORGAN_SLOT_BRAIN, 30)
 		addtimer(CALLBACK(user, /mob/living.proc/dropItemToGround, src, TRUE), 1) //equipped happens before putting stuff on(but not before picking items up), 1). thus, we need to wait for it to be on before forcing it off.
 
 /obj/item/clothing/head/helmet/clockwork/mob_can_equip(mob/M, mob/equipper, slot, disable_warning = 0)

code/modules/antagonists/slaughter/slaughter.dm

@@ -80,6 +80,7 @@
 	desc = "Still it beats furiously, emanating an aura of utter hate."
 	icon = 'icons/obj/surgery.dmi'
 	icon_state = "demon_heart-on"
+	decay_factor = 0
 
 /obj/item/organ/heart/demon/update_icon()
 	return //always beating visually