Merge pull request #5055 from Citadel-Station-13/upstream-merge-34808

[MIRROR] Abstract landmarks are now indestructible

code/game/objects/effects/landmarks.dm

@@ -4,6 +4,18 @@
 	icon_state = "x2"
 	anchored = TRUE
 	invisibility = INVISIBILITY_ABSTRACT
+	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
+
+/obj/effect/landmark/singularity_act()
+	return
+
+// Please stop bombing the Observer-Start landmark.
+/obj/effect/landmark/ex_act()
+	return
+
+/obj/effect/landmark/singularity_pull()
+	return
+
 
 /obj/effect/landmark/New()
 	..()