Attempt fix blackscreen (#18434)

* first reordering, committed in case i fuck up badly next

* from the moment i understood the weakness of my flesh

* sdafa

* you asked for this

* we can't have nice things

* sdafasdf

* sdafasd

* sdfa

* fsa

* worth a shot

* more pain

* sdfasdf

code/game/objects/effects/landmarks.dm

@@ -108,6 +108,26 @@
 
 	return 1
 
+/obj/effect/landmark/lobby_mobs_location
+	name = "lobby_mobs_location"
+	anchored = TRUE
+	invisibility = 101
+
+INITIALIZE_IMMEDIATE(/obj/effect/landmark/lobby_mobs_location)
+
+/obj/effect/landmark/lobby_mobs_location/Initialize()
+	..()
+
+	if(GLOB.lobby_mobs_location)
+		crash_with("There must be one, and only one, /obj/effect/landmark/lobby_mobs_location effect in any single server session!")
+
+	else
+		GLOB.lobby_mobs_location = get_turf(src)
+		ASSERT(istype(GLOB.lobby_mobs_location, /turf))
+
+	return INITIALIZE_HINT_QDEL
+
+
 //Costume spawner landmarks
 /obj/effect/landmark/costume/New() //costume spawner, selects a random subclass and disappears