I recently went into the nether and found loads and loads of wither skeletons spawning, but after I killed them all they stopped spawning altogether. Why is this? This is occurring in the Xbox One version.
There are three (3) requirements for a Wither Skeleton to spawn:
- Light levels must be 7 or less
- Must be on Nether Fortress (on nether bricks and their variants)
- Must have 3 blocks of vertical space (wither skeletons are 2.5 blocks tall)
In other words, be sure to hang around dark Nether Fortress with plenty of head room.