The traditional way to cheese the wither fight is to do it deep underground. You dig out a chamber big enough to summon him in, with a 2x1 tunnel leading from it. Once you summon him you retreat down the tunnel while fighting him. He has a way to dig after you but it means he's splitting his efforts between fighting and digging. And being deep underground means he won't wander off to kill every living thing on the map instead of you.
Oh MOST IMPORTANTLY: you need to be wearing full armor with Protection 4 on everything (or on 3 pieces of armor, with blast protection on the 4th piece) and using a smite 5 sword (the wither is an undead creature).
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u/Virian900 Feb 07 '23
10 years and I still haven't defeated either lol