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the Aminium Wither is a wither composed of entirely Adminium, and has a total of 80000 hitpoints. This wither is invulnerable to almost all attacks. The skulls of the Adminium Wither will explode and form solid Adminium blocks when they come in contact with a surface. If you do not have a way to break it, you will suffocate. But why worry about that and not just getting torn apart by the sheer power of this wither.
There are few things that can damage it, but if you find a way, the Adminuim Wither will grow more and more unstable until it finally explodes upon reaching 0 hp. It will drop several stacks of nether stars upon dying.