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The Wither boss is a summoned mob. It is summoned by placing soul sand in the positions for iron blocks for a iron golem and placing three wither skeleton skulls atop all three pieces of soul sand and you will get, THE WITHER BOSS!
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Wither skeletons are commonly found in nether fortresses but will at times can be found around nether portals. They are three blocks tall, they wield stone swords but do NOT be fooled, they will (if they hit you) give you a wither affect witch will kill your character. In the nether they have a tendency of "Floating" which makes them very fast. They drop 4 different items, bones, coal,stone swords (rarely), and Wither Skeleton skulls (very rarely).