A structural cage used in conjunction with the spawner controller. The cages must be placed directly beneath the controller to create a valid spawning area.

Sizing

The required size of the cage depends on the size of the mob being spawned. Specifically, the cage must be wide enough for roughly twice the mob's width and tall enough for its height.

When a mob type is set in the controller, it will visually highlight the needed cage dimensions. If the cage is incomplete or incorrect, the spawner will not operate.