Black Temple interior showing mob spawns.
You find a Black Dragon Egg here. It consists of a large rectangular room with 6 Monster Spawners with a small pedestal in the middle.
The temple is completely enclosed and you need to mine some of the bricks to get in.
Location[]
Can be only be found at or under the 30 block mark on the Y Axis (deep underground).
They can be found in the Overworld and the Nether.
Dragon Egg[]
To spawn the Black Dragon Egg you need to destroy the 6 monster spawners.
Black Temple interior with spawners lit up.
Black Temple with the egg spawned.
Black Temple which spawned under the lava in the Nether. It has been dug out to show the full size of it.