You have to make one with 4 soul sand and 3 wither skulls. Here is the pattern
s-soul sand
w-wither skull
w w w
s s s
s
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Make a T of Soulsand, and put wither skeleton heads ontop
Wither skeletons will only spawn in the Nether Fortresses. The Wither Skeletons are rare mobs that are only in the Nether, more specifically the Nether Fortress. Unlike regular skeletons the wither skeleton carries a sword and when hit by a Wither Skeleton you will be come infected by the wither effect.
Wither Boss
The Ender Dragon and the Wither are currently the only boss monsters in minecraft.