Minecraft wiki entry for Void, associated text: Other entities may also fall through the void and receive the same damage as the player, with the exception of the wither, which appears to take tremendous damage. The ender dragon is completely immune to the void damage. All entities disappear at 64 blocks into the void. Any entity between 64 and 319 blocks into the void appears as black. In the Overworld and in the Nether, a barrier layer of bedrock prevents the player from accessing the void. In the End, however, the void is easily accessible due to the large gaps between the islands.