Wither Skeleton Shrines in the Nether

A rare structure that would consist of a 9×9 floor made of nether brick, with a chest in the center containing loot.

On top of this chest, there would be a 6 block tall pillar made of obsidian, forcing you to mine the obsidian to get the loot. On top of the pillar would be a Wither Skeleton Skull.

On the floor, 5 Wither Skeletons would spawn, along with one regular skeleton.