The Incomplete Wither is a hostile mob provided by Stalwart Dungeons that can be found in the Nether. It’s slightly different to its regular Wither Skeleton counterpart, as it has two heads and is also equipped with a Tungsten Axe.
ABOUT
The Incomplete Wither Skeleton can only be found spawning within the Awful Dungeon, one of the two Nether Dungeons added with Stalwart Dungeons. They can be found roaming the structure alongside the Reinforced Blaze, both of which defend the Awful Ghast Altar.

In total, they have 30 Health, which is more than the Reinforced Blaze. However, they only have 1 Armor point, so they’re much easier to kill. However, be careful, as they still deal with high amounts of damage and can quickly overrun the player. It should also be noted that they don’t inflict the player with the Wither debuff.
LOOT
Killing an Incomplete Wither Skeleton doesn’t provide any new items from the Stalwart Dungeons mod. Instead, it rewards the player with 1-3 Coal, 1-2 Bones, and a chance to obtain the Wither Skeleton Skull. Players will also receive 50 experience.
A standard Wither Skeleton has a 2.5% chance of dropping the Wither Skeleton Skull. The Incomplete Wither has a 5% chance instead, effectively doubling the chance of getting the drop.

Therefore, it’s worth finding an Awful Dungeon solely to farm the Incomplete Wither to collect enough heads to summon a Vanilla Wither. As Spawners are located within the Awful Dungeons that summon the Incomplete Wither, it’s a very effective method.

