You need 4 soul sand and 3 wither skeleton heads.
You make it like an iron golem, with the 4 soul sand shaped like a "T", and a wither head in the middle. Then, you put the other 2 heads on the left and right of the middle head.
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Make a T of Soulsand, and put wither skeleton heads ontop
You don't find it. Go to the nether and fight the wither skeletons to the death and they will drop a wither skull eventually. Be careful of their hits on you or you'll be withered. Next ingrediant is soul sand which is in nether forts like the wither skeletons so find a nether fort fast or you will have a hard time trying to summon the wither. You need 4 soul sand and 3 wither skulls. Be prepared for the fight and here's the formation s= soul sand w w w w= wither skull s s s s To sum it up, you need 4 soul sand like the iron blocks needed to summon an iron golem and the wither skulls are placed on the top soul sand. Good luck! Fighting: Okay I will answer how to fight it. The wither is very annoying to fight. Tips - bring golden apples and potions, be serious - enchant sword with sharpness and smite - fire nor arrows can't touch him - ride in a horse for agility( if not use a minecart, remember you can summon it whenever you want wherever you want) - because you can summon it anywhere, use this advantage to summon him in a minefield with obsidian Attack pattern: He will shoot wither skulls which will explode on contact. Beware of where you summon him because he will kill other mobs. Yes, your pigs will die if he sees them. The wither skulls give the victim the wither effect which will heal the wither too. Health is 150 hp(half hearts) and be careful.
Wither Boss
The Ender Dragon and the Wither are currently the only boss monsters in minecraft.