diff --git a/abms.lua b/abms.lua
index 2d634ee..3f8dded 100644
--- a/abms.lua
+++ b/abms.lua
@@ -302,7 +302,19 @@ minetest.register_abm({
 	nodenames = {"fun_caves:casket"},
 	interval = 2,
 	chance = 10,
-	action = function(pos, node)
+	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
diff --git a/pyramid.lua b/pyramid.lua
index d2b091c..4d96d36 100644
--- a/pyramid.lua
+++ b/pyramid.lua
@@ -8,11 +8,6 @@ newnode.groups.pyramid = 1
 newnode.drop = 'default:sandstone'
 minetest.register_node("fun_caves:pyramid_1", newnode)
 
-local newnode = fun_caves.clone_node("default:chest")
-newnode.description = "Treasure Casket"
-newnode.light_source = 1
-newnode.on_construct = nil
-
 local chest_formspec =
 	"size[8,9]" ..
 	default.gui_bg ..
@@ -33,16 +28,16 @@ end
 
 local gems = {'fun_caves:moonstone', 'fun_caves:coral_gem', 'fun_caves:garnet', 'fun_caves:aquamarine', 'fun_caves:zoisite', 'fun_caves:sky_iron'}
 
+local newnode = fun_caves.clone_node("default:chest")
+newnode.description = "Treasure Casket"
+newnode.light_source = 1
+newnode.on_construct = nil
 newnode.on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
 	local meta = minetest.get_meta(pos)
 	local ready = meta:get_string('formspec')
 
 	if ready == '' then
-		if math.random(15) ~= 1 then
-			meta:set_string("formspec", 'del')
-			clicker:set_hp(clicker:get_hp() - 2)
-			minetest.remove_node(pos)
-		else
+		if math.random(10) == 1 then
 			meta:set_string("formspec", chest_formspec)
 			local inv = meta:get_inventory()
 			inv:set_size("main", 8*4)
@@ -50,6 +45,10 @@ newnode.on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
 				inv:add_item('main', filler[math.random(#filler)])
 			end
 			inv:add_item('main', gems[math.random(#gems)])
+		else
+			meta:set_string("formspec", 'del')
+			clicker:set_hp(clicker:get_hp() - 2)
+			minetest.remove_node(pos)
 		end
 	end
 end