Killing the wither can do a lot of damage to your armor. Here is an easy way to kill the wither.
How To Build
How To Build
1. Find a 3x3 bedrock field in the ceiling of the nether with an air pocket above the center block.
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2. Go 3 blocks down, dig a hole in the ground and put a piston there. Put a lever next to it.
3. Build a wither on top of the piston like so:
4. Flick the lever.
5. Kill the wither!