Porting objective code refactor

code/modules/mining/lavaland/necropolis_chests.dm

@@ -1022,21 +1022,10 @@
 
 	message_admins("<span class='adminnotice'>[ADMIN_LOOKUPFLW(L)] has been marked for death by [ADMIN_LOOKUPFLW(user)]!</span>")
 
-	var/datum/objective/survive/survive = new
-	survive.owner = L.mind
-	L.mind.objectives += survive
+	var/datum/antagonist/blood_contract/A = new
+	L.mind.add_antag_datum(A)
+
 	log_combat(user, L, "took out a blood contract on", src)
-	to_chat(L, "<span class='userdanger'>You've been marked for death! Don't let the demons get you! KILL THEM ALL!</span>")
-	L.add_atom_colour("#FF0000", ADMIN_COLOUR_PRIORITY)
-	var/obj/effect/mine/pickup/bloodbath/B = new(L)
-	INVOKE_ASYNC(B, /obj/effect/mine/pickup/bloodbath/.proc/mineEffect, L)
-
-	for(var/mob/living/carbon/human/H in GLOB.player_list)
-		if(H == L)
-			continue
-		to_chat(H, "<span class='userdanger'>You have an overwhelming desire to kill [L]. [L.p_theyve(TRUE)] been marked red! Whoever [L.p_they()] [L.p_were()], friend or foe, go kill [L.p_them()]!</span>")
-		H.put_in_hands(new /obj/item/kitchen/knife/butcher(H), TRUE)
-
 	qdel(src)
 
 //Colossus