Adds some neat tiles and walls for use on lavaland

code/game/turfs/closed.dm

@@ -116,6 +116,23 @@
 	underlay_appearance.icon_state = "necro1"
 	return TRUE
 
+/turf/closed/indestructible/riveted/boss
+	name = "stone wall"
+	desc = "A thick, seemingly indestructible stone wall."
+	icon = 'icons/turf/walls/boss_wall.dmi'
+	icon_state = "wall"
+	explosion_block = 50
+	baseturf = /turf/closed/indestructible/riveted/boss
+
+/turf/closed/indestructible/riveted/boss/hot
+	icon = 'icons/turf/walls/boss_wall_hot.dmi'
+	baseturf = /turf/closed/indestructible/riveted/boss/hot
+
+/turf/closed/indestructible/riveted/boss/get_smooth_underlay_icon(mutable_appearance/underlay_appearance, turf/asking_turf, adjacency_dir)
+	underlay_appearance.icon = 'icons/turf/floors.dmi'
+	underlay_appearance.icon_state = "basalt"
+	return TRUE
+
 /turf/closed/indestructible/riveted/hierophant
 	name = "wall"
 	desc = "A wall made out of a strange metal. The squares on it pulse in a predictable pattern."

code/game/turfs/simulated/chasm.dm

@@ -54,8 +54,16 @@
 		else
 			to_chat(user, "<span class='warning'>The plating is going to need some support! Place metal rods first.</span>")
 
+/turf/open/chasm/proc/is_safe()
+	//if anything matching this typecache is found in the chasm, we don't drop things
+	var/static/list/chasm_safeties_typecache = typecacheof(list(/obj/structure/lattice/catwalk, /obj/structure/stone_tile))
+	var/list/found_safeties = typecache_filter_list(contents, chasm_safeties_typecache)
+	return LAZYLEN(found_safeties)
+
 /turf/open/chasm/proc/drop_stuff(AM)
 	. = 0
+	if(is_safe())
+		return FALSE
 	var/thing_to_check = src
 	if(AM)
 		thing_to_check = list(AM)

code/game/turfs/simulated/floor/plating/lava.dm

@@ -54,7 +54,7 @@
 
 /turf/open/floor/plating/lava/proc/is_safe()
 	//if anything matching this typecache is found in the lava, we don't burn things
-	var/static/list/lava_safeties_typecache = typecacheof(list(/obj/structure/lattice/catwalk))
+	var/static/list/lava_safeties_typecache = typecacheof(list(/obj/structure/lattice/catwalk, /obj/structure/stone_tile))
 	var/list/found_safeties = typecache_filter_list(contents, lava_safeties_typecache)
 	return LAZYLEN(found_safeties)