wither skeleton (minecraft)
Wither Skeleton is a tall, black, undead hostile mob in Minecraft. They are armed with stone swords and only spawn at Nether Fortress. Unlike their Overworld counterpart with bows. They deal deadly wither effect that turns player's hearts black and depletes health.
Upon death it can either drop bone, coal, or stone sword with random durability point. This includes small chance (2.5%) of dropping its own skull. The Wither boss has chance to summon 3-4 wither skeletons on ground.