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.
Make a T of Soulsand, and put wither skeleton heads ontop
Now Getting a wither skeleton's head is pritty rare because this is like trying to find emeralds, becasue you may have to kill a lot of wither's before they drops a Wither Head, now i have watched a video where it took someone 150 kills to get 3 wither heads
well when 1.4 comes out it will take 4 soul sand in a t shape and put 3 wither skeleton skulls on top (the skull is a rare drop from a type of skeleton in the nether) you must have it on easy, medium or hard for it to work.
As of 1.4.2, some monsters drop their heads as trophies when killed. A head from a Skeleton or a Wither Skeleton, is a skull.
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.
To create a Wither portal, you need to gather four soul sand blocks and three wither skeleton skulls. First, place the soul sand in a T-shape (three blocks horizontally and one block upright in the middle). Then, place the wither skeleton skulls on top of the upright soul sand block. Activating the Wither requires that you summon it by placing the skulls on the T-shaped structure, leading to its creation rather than a traditional portal.
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.
In Minecraft, a Wither is a hostile mobile game entity which can be spawned by the player only in Nether Fortresses. It is skeletal in appearance, has three heads and floats. Fighting the Wither can be difficult, and it is considered a boss enemy.
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.
The Wither is spawned when you place the following blocks in this order: H-H-H S-S-S -- S -- H = Wither skeleton skull S = Soul sand N.B. You must place the physical blocks - not craft them! Good luck!!