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.
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Make a T of Soulsand, and put wither skeleton heads ontop
Use a spawn egg in creative or look for a nether fotress where they spawn.
The recipe for the Wither Skeleton consists of four Soul Sand arranged in a 'T' position and three Wither Skulls placed on the three topmost blocks.
Yes it is a glitch. When a spider is spawned in creative mode it has a 0.8% chance of spawning with a wither skeleton as a rider. A spider spawned in nether also has a 0.2% chance of spawning with a normal skeleton rider. The wither skeleton jockey can only be spawned in creative mode but you can fight if you open to LAN and allow cheats. Then say /gamemode 0 or /gamemode 2 to fight it in survival or adventure. It is considered weaker then the normal spider jockey becuase both the wither skeleton and spider use melee attacks. Be careful when spawning this monster and changing to survival or adventure.
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