diff --git a/mods/ENTITIES/mcl_mobs/breeding.lua b/mods/ENTITIES/mcl_mobs/breeding.lua
index 90e625db8..559195681 100644
--- a/mods/ENTITIES/mcl_mobs/breeding.lua
+++ b/mods/ENTITIES/mcl_mobs/breeding.lua
@@ -105,7 +105,7 @@ end
 
 -- Spawn a child
 function mcl_mobs.spawn_child(pos, mob_type)
-	local child = minetest.add_entity(pos, mob_type)
+	local child = mcl_mobs.spawn(pos, mob_type)
 	if not child then
 		return
 	end
@@ -285,6 +285,7 @@ function mob_class:check_breeding()
 					end
 
 					local child = mcl_mobs.spawn_child(pos, parent1.name)
+					if not child then return end
 
 					local ent_c = child:get_luaentity()
 
diff --git a/mods/ENTITIES/mcl_mobs/init.lua b/mods/ENTITIES/mcl_mobs/init.lua
index 81b5fdfe7..74e6edbec 100644
--- a/mods/ENTITIES/mcl_mobs/init.lua
+++ b/mods/ENTITIES/mcl_mobs/init.lua
@@ -528,7 +528,7 @@ end
 -- Note: This also introduces the “spawn_egg” group:
 -- * spawn_egg=1: Spawn egg (generic mob, no metadata)
 -- * spawn_egg=2: Spawn egg (captured/tamed mob, metadata)
-function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addegg, no_creative)
+function mcl_mobs.register_egg(mob_id, desc, background_color, overlay_color, addegg, no_creative)
 
 	local grp = {spawn_egg = 1}
 
@@ -539,7 +539,7 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 
 	local invimg = "(spawn_egg.png^[multiply:" .. background_color ..")^(spawn_egg_overlay.png^[multiply:" .. overlay_color .. ")"
 	if old_spawn_icons then
-		local mobname = mob:gsub("mobs_mc:","")
+		local mobname = mob_id:gsub("mobs_mc:","")
 		local fn = "mobs_mc_spawn_icon_"..mobname..".png"
 		if mcl_util.file_exists(minetest.get_modpath("mobs_mc").."/textures/"..fn) then
 			invimg = fn
@@ -551,7 +551,7 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 	end
 
 	-- register old stackable mob egg
-	minetest.register_craftitem(mob, {
+	minetest.register_craftitem(mob_id, {
 
 		description = desc,
 		inventory_image = invimg,
@@ -561,7 +561,6 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 		_doc_items_usagehelp = S("Just place it where you want the mob to appear. Animals will spawn tamed, unless you hold down the sneak key while placing. If you place this on a mob spawner, you change the mob it spawns."),
 
 		on_place = function(itemstack, placer, pointed_thing)
-
 			local pos = pointed_thing.above
 
 			-- am I clicking on something with existing on_rightclick function?
@@ -571,11 +570,12 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 				return def.on_rightclick(pointed_thing.under, under, placer, itemstack)
 			end
 
+			local mob_name = itemstack:get_name()
+
 			if pos and within_limits(pos, 0)  and not minetest.is_protected(pos, placer:get_player_name()) then
 				local name = placer:get_player_name()
 				local privs = minetest.get_player_privs(name)
 
-
 				if under.name == "mcl_mobspawners:spawner" then
 					if minetest.is_protected(pointed_thing.under, name) then
 						minetest.record_protection_violation(pointed_thing.under, name)
@@ -593,7 +593,6 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 					--minetest.log("max light: " .. mob_light_lvl[2])
 
 					-- Handle egg conversion
-					local mob_name = itemstack:get_name()
 					local convert_to = (minetest.registered_entities[mob_name] or {})._convert_to
 					if convert_to then mob_name = convert_to end
 
@@ -604,19 +603,24 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 					return itemstack
 				end
 
-				if not minetest.registered_entities[mob] then
+				if not minetest.registered_entities[mob_name] then
 					return itemstack
 				end
 
 				if minetest.settings:get_bool("only_peaceful_mobs", false)
-						and minetest.registered_entities[mob].type == "monster" then
+						and minetest.registered_entities[mob_name].type == "monster" then
 					minetest.chat_send_player(name, S("Only peaceful mobs allowed!"))
 					return itemstack
 				end
 
-				pos.y = pos.y - 0.5
+				pos.y = pos.y - 1
+				local mob = mcl_mobs.spawn(pos, mob_name)
+				if not object then
+					pos.y = pos.y + 1
+					mob = mcl_mobs.spawn(pos, mob_name)
+					if not mob then return end
+				end
 
-				local mob = minetest.add_entity(pos, mob)
 				local entityname = itemstack:get_name()
 				minetest.log("action", "Player " ..name.." spawned "..entityname.." at "..minetest.pos_to_string(pos))
 				local ent = mob:get_luaentity()
@@ -647,5 +651,4 @@ function mcl_mobs.register_egg(mob, desc, background_color, overlay_color, addeg
 			return itemstack
 		end,
 	})
-
 end
diff --git a/mods/ENTITIES/mcl_mobs/spawning.lua b/mods/ENTITIES/mcl_mobs/spawning.lua
index d5ebe8788..332603392 100644
--- a/mods/ENTITIES/mcl_mobs/spawning.lua
+++ b/mods/ENTITIES/mcl_mobs/spawning.lua
@@ -1,4 +1,5 @@
 --lua locals
+local DEBUG = false
 local math, vector, minetest, mcl_mobs = math, vector, minetest, mcl_mobs
 local mob_class = mcl_mobs.mob_class
 
@@ -547,7 +548,7 @@ local function has_room(self, pos)
 	local cb_height = cb[5] - cb[2]
 	local p1 = vector.new(
 		math.round(pos.x + cb[1]),
-		pos.y,
+		math.floor(pos.y),
 		math.round(pos.z + cb[3]))
 	local p2 = vector.new(
 		math.round(pos.x + cb[4]),
@@ -560,20 +561,20 @@ local function has_room(self, pos)
 	local dz = p2.z - p1.z + 1
 	local found_nodes = minetest.find_nodes_in_area(p1,p2,nodes) or 0
 	local n = #found_nodes
-	--[[
-	minetest.log(dump({
-		cb = cb,
-		pos = pos,
-		n = n,
-		dx = dx,
-		dy = dy,
-		dz = dz,
-		p1 = p1,
-		p2 = p2,
-		found_nodes = found_nodes,
-		nodes = nodes,
-	}))
-	]]
+	if DEBUG then
+		minetest.log(dump({
+			cb = cb,
+			pos = pos,
+			n = n,
+			dx = dx,
+			dy = dy,
+			dz = dz,
+			p1 = p1,
+			p2 = p2,
+			found_nodes = found_nodes,
+			nodes = nodes,
+		}))
+	end
 	if n == dx * dy * dz then
 		return true
 	end
@@ -623,7 +624,6 @@ local function has_room(self, pos)
 	if top_layer_height + dy - 1 >= cb_height then return true end
 
 	-- We don't have room
-	mcl_log("No room for mob "..self.name.." at "..minetest.pos_to_string(vector.round(pos)))
 	return false
 end
 
diff --git a/mods/ENTITIES/mobs_mc/slime+magma_cube.lua b/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
index fa9d24d09..57eb5a859 100644
--- a/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
+++ b/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
@@ -53,12 +53,14 @@ local spawn_children_on_die = function(child_mob, spawn_distance, eject_speed)
 					eject_speed = eject_speed * 0.5
 				end
 			end
-			local mob = minetest.add_entity(newpos, child_mob)
-			if not mother_stuck then
-				mob:set_velocity(dir * eject_speed)
+			local mob = mcl_mobs.spawn(newpos, child_mob)
+			if mob then
+				if not mother_stuck then
+					mob:set_velocity(dir * eject_speed)
+				end
+				mob:set_yaw(angle - math.pi/2)
+				table.insert(children, mob)
 			end
-			mob:set_yaw(angle - math.pi/2)
-			table.insert(children, mob)
 			angle = angle + (math.pi*2) / spawn_count
 		end
 		-- If mother was murdered, children attack the killer after 1 second
diff --git a/mods/ENTITIES/mobs_mc/villager_evoker.lua b/mods/ENTITIES/mobs_mc/villager_evoker.lua
index 9d465c25d..2dc175341 100644
--- a/mods/ENTITIES/mobs_mc/villager_evoker.lua
+++ b/mods/ENTITIES/mobs_mc/villager_evoker.lua
@@ -55,14 +55,16 @@ mcl_mobs.register_mob("mobs_mc:evoker", {
 		basepos.y = basepos.y + 1
 		for i=1, r do
 			local spawnpos = vector.add(basepos, minetest.yaw_to_dir(pr:next(0,360)))
-			local vex = minetest.add_entity(spawnpos, "mobs_mc:vex")
-			local ent = vex:get_luaentity()
+			local vex = mcl_mobs.spawn(spawnpos, "mobs_mc:vex")
+			if vex then
+				local ent = vex:get_luaentity()
 
-			-- Mark vexes as summoned and start their life clock (they take damage it reaches 0)
-			ent._summoned = true
-			ent._lifetimer = pr:next(33, 108)
+				-- Mark vexes as summoned and start their life clock (they take damage it reaches 0)
+				ent._summoned = true
+				ent._lifetimer = pr:next(33, 108)
 
-			table.insert(spawned_vexes[self],ent)
+				table.insert(spawned_vexes[self],ent)
+			end
 		end
 	end,
 	passive = false,
diff --git a/mods/ENVIRONMENT/lightning/init.lua b/mods/ENVIRONMENT/lightning/init.lua
index 079c9cb38..d4756bd9f 100644
--- a/mods/ENVIRONMENT/lightning/init.lua
+++ b/mods/ENVIRONMENT/lightning/init.lua
@@ -19,7 +19,6 @@ local set_node = minetest.set_node
 local sound_play = minetest.sound_play
 local add_particlespawner = minetest.add_particlespawner
 local after = minetest.after
-local add_entity = minetest.add_entity
 local get_objects_inside_radius = minetest.get_objects_inside_radius
 local get_item_group = minetest.get_item_group
 
@@ -165,7 +164,7 @@ function lightning.strike_func(pos, pos2, objects)
 
 	-- Events caused by the lightning strike: Fire, damage, mob transformations, rare skeleton spawn
 
-	pos2.y = pos2.y + 1/2
+	pos2.y = pos2.y + 1
 	local skeleton_lightning = false
 	if rng:next(1,100) <= 3 then
 		skeleton_lightning = true
@@ -174,14 +173,14 @@ function lightning.strike_func(pos, pos2, objects)
 		if get_node(pos2).name == "air" then
 			-- Low chance for a lightning to spawn skeleton horse + skeletons
 			if skeleton_lightning then
-				add_entity(pos2, "mobs_mc:skeleton_horse")
+				mcl_mobs.spawn(pos2, "mobs_mc:skeleton_horse")
 
 				local angle, posadd
 				angle = math.random() * math.pi * 2
 				for i=1,3 do
 					posadd = { x=math.cos(angle),y=0,z=math.sin(angle) }
 					posadd = vector.normalize(posadd)
-					local mob = add_entity(vector.add(pos2, posadd), "mobs_mc:skeleton")
+					local mob = mcl_mobs.spawn(vector.add(pos2, posadd), "mobs_mc:skeleton")
 					if mob then
 						mob:set_yaw(angle-math.pi/2)
 					end