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This is outdated for two reasons: 1. Anvils are capped at 12 hearts of damage. 2. Blue wither skulls can break obsidian.

Key

Template:Grid: Air

How To Build

1.
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2.
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3.
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4.
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5.
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6.
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8.
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9. Build the gravel up to the build barrier (Layer 256)
10. Ask your friend to awaken the wither and tell him to run away
11. Drop an anvil through the hole to hit the wither, you may need to do this twice
12. To get down, tell your friend to destroy the Wool block

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