def change_position
    $server.maps[@map_id].respawn_regions.size.times do
      region_id = rand($server.maps[@map_id].respawn_regions.size)
      x = $server.maps[@map_id].respawn_regions[region_id].x
      y = $server.maps[@map_id].respawn_regions[region_id].y
      if passable?(x, y, 0)
        moveto(x, y)
        break
      end
    end
  end