how to spawn the wither in Minecraft
1 Wither Skeletons can only be found in Nether Fortresses, and even then they don't drop very often. 2  Use the Looting enchantment to help you gather the three Skulls you need. 3  You will probably need to kill around 100 Wither Skeletons to find the three Skulls. 4  Soul Sand can be found in a variety of places in the Nether.