PyuTest.create_boss_egg = function(mob_id, desc, texture, addegg, no_creative, craft)
  mobs:register_egg(mob_id, desc, texture, addegg, no_creative)

  core.register_craft({
    output = mob_id,
    recipe = {
      { "",    craft,                        "" },
      { craft, "pyutest_ores:emerald_shard", craft },
      { "",    craft,                        "" }
    }
  })

  local t = mob_id:split(":")
  local mob_name = t[#t]

  local cage_id = "pyutest_mobs:" .. mob_name .. "_spawn_cage"
  PyuTest.make_node(cage_id, desc:gsub("Spawn Egg", "") .. "Boss Spawner Cage", {
    cracky = PyuTest.BLOCK_SLOW
  }, { "pyutest-cage.png" }, {
    drawtype = "glasslike",
    on_rightclick = function(pos)
      mobs:add_mob(vector.add(pos, vector.new(0, 1, 0)), {
        name = mob_id,
        child = false,
        ignore_count = true
      })
      core.remove_node(pos)
    end
  })
end