diff --git a/abms.lua b/abms.lua
index 0e7f612..c628180 100644
--- a/abms.lua
+++ b/abms.lua
@@ -330,40 +330,24 @@ minetest.register_abm({
 	end
 })
 
+if false then
 minetest.register_abm({
-	nodenames = {"fun_caves:casket"},
-	interval = 2,
-	chance = 10,
-	catch_up = false,
-	action = function(pos, node, aoc, active_object_count_wider)
-		-- do not spawn if too many active entities in area
-		if active_object_count_wider > 5 then
-			return
-		end
-
-		local meta = minetest.get_meta(pos)
-		local ready = meta:get_string('formspec')
-		if ready ~= '' then
-			return
-		end
-
-		local objs = minetest.get_objects_inside_radius(pos, 7)
-		for i = 1, #objs do
-			if objs[i]:is_player() then
-				local p1 = vector.subtract(pos, 3)
-				local p2 = vector.add(pos, 3)
-				local nodes = minetest.find_nodes_in_area_under_air(p1, p2, {'fun_caves:pyramid_1'})
-				if nodes and #nodes > 0 then
-					if math.random(3) == 1 then
-						minetest.add_entity(nodes[math.random(#nodes)], 'mobs_monster:stone_monster')
-					else
-						minetest.add_entity(nodes[math.random(#nodes)], 'fun_caves:sand_monster')
-					end
-				end
+	nodenames = {"fun_caves:pyramid_1"},
+	interval = 1,
+	chance = 1,
+	action = function(pos, node)
+		local p = table.copy(pos)
+		for i = 1, 20 do
+			p.y = p.y + 1
+			local node = minetest.get_node_or_nil(p)
+			if not node or node.name ~= 'air' then
+				return
 			end
 		end
+		minetest.set_node(pos, {name = 'default:sandstone'})
 	end
 })
+end
 
 local no_tree_grow = {'fun_caves:bark', 'fun_caves:leaves'}
 local wood_nodes = {{name = 'fun_caves:diamondwood'}, {name = 'fun_caves:ironwood'}, {name = 'fun_caves:sap'}, {name = 'fun_caves:tree'}}
diff --git a/mobs.lua b/mobs.lua
index 1bc44ea..291758b 100644
--- a/mobs.lua
+++ b/mobs.lua
@@ -629,6 +629,12 @@ if minetest.registered_entities["mobs_monster:sand_monster"] then
 	mobs:register_spawn("fun_caves:sand_monster", {"default:sand"}, 20, 0, 4000, 3, -50)
 
 	mobs:register_egg("fun_caves:sand_monster", "Deep Sand Monster", "default_sand.png", 1)
+
+	mobs:register_spawn("fun_caves:sand_monster", {"fun_caves:pyramid_1"}, 20, 0, 150, 5, 31000)
+end
+
+if minetest.registered_entities["mobs_monster:stone_monster"] then
+	mobs:register_spawn("mobs_monster:stone_monster", {"fun_caves:pyramid_1"}, 20, 0, 300, 5, 31000)
 end
 
 -- Change the original, rather than making a copy.