unrobustin fixes

code/game/turfs/simulated/walls.dm

@@ -38,7 +38,8 @@
 	else
 		playsound(src, 'sound/items/Welder.ogg', 100, 1)
 		var/newgirder = break_wall()
-		transfer_fingerprints_to(newgirder)
+		if(newgirder) //maybe we don't /want/ a girder!
+			transfer_fingerprints_to(newgirder)
 
 	for(var/obj/O in src.contents) //Eject contents!
 		if(istype(O,/obj/structure/sign/poster))

code/game/turfs/simulated/walls_misc.dm

@@ -1,5 +1,5 @@
 /turf/closed/wall/cult
-	name = "runed wall"
+	name = "runed metal wall"
 	desc = "A cold metal wall engraved with indecipherable symbols. Studying them causes your head to pound."
 	icon = 'icons/turf/walls/cult_wall.dmi'
 	icon_state = "cult"
@@ -21,6 +21,17 @@
 /turf/closed/wall/cult/narsie_act()
 	return
 
+/turf/closed/wall/cult/artificer
+	name = "runed stone wall"
+	desc = "A cold stone wall engraved with indecipherable symbols. Studying them causes your head to pound."
+
+/turf/closed/wall/cult/artificer/break_wall()
+	PoolOrNew(/obj/effect/overlay/temp/cult/turf, get_turf(src))
+	return null //excuse me we want no runed metal here
+
+/turf/closed/wall/cult/artificer/devastate_wall()
+	PoolOrNew(/obj/effect/overlay/temp/cult/turf, get_turf(src))
+
 /turf/closed/wall/vault
 	icon = 'icons/turf/walls.dmi'
 	icon_state = "rockvault"

code/modules/spells/spell_types/construct_spells.dm

@@ -36,7 +36,7 @@
 	action_icon_state = "lesserconstruct"
 	action_background_icon_state = "bg_cult"
 
-	summon_type = list(/turf/closed/wall/cult)
+	summon_type = list(/turf/closed/wall/cult/artificer) //we don't want artificer-based runed metal farms
 
 /obj/effect/proc_holder/spell/aoe_turf/conjure/wall/reinforced
 	name = "Greater Construction"