Wither Skeleton

Wither Skeletons are dangerous hostile mobs that spawn in Nether Fortresses. Wither Skeletons are the Nether equivalent of Skeletons. Unlike Skeletons, however, Wither Skeletons use stone swords and are over two blocks tall. When hit by a Wither Skeleton, you can be inflicted with the "Wither" effect for a few seconds. When killed, the mob can drop coal and bones and very rarely drop their skull and the stone sword. The skulls are the key items to creating the dreaded Wither boss.

Wither Skeletons, like all Nether mobs, are immune to fire and lava and do not get damaged by daylight. Wither Skeletons can also occasionally pick up items, weapons, and tools, or spawn naturally with armor, similar to Zombies, Zombie Pigmen, etc.

Skeleton Spawn Eggs are able spawn Wither Skeletons instead of the Skeletons only when used in the Nether.

Trivia

 * The relationship between Wither Skeletons and Skeletons can be seen as similar to Zombie Pigmen and Zombies.
 * It is possible that the Wither Skeletons are the living Skeletons of Enderman due to their height

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