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The Void is a dimension similar to the end. Except it is made bedrock and obsidian. It is also inhabited by hostile wither turrets and Witherzilla. To get there you craft a creepy wither doll out of four blocks of soul sand and three wither skeleton skulls on a crafting table (trying to build it like a statue will spawn a wither boss) then once have it you to the End and go to at least five blocks away from the exit portal and you're in the void. The only way to get out is by either dying or beating witherzilla.