You'll be battling against a (nearly) immortal Piglin. You spawn in a room, and go to the nether portal. Get the armor from the chests, and click the button. You'll then be battling the OP Piglin.
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Changelog
I fixed the link and added stair on the outsides of the arena. I added these stairs so you can get back in incase if the Piglin knocks you outside of it.





Still good thing it is....
Can I get permission to replicate this idea for me to do what I think is missing in this map?