Undead

Undead mobs refer to mobs that are considered undead. Undead mobs share certain traits: they take continuous fire damage in sunlight, they are healed by Instant Damage potions and harmed by Instant Healing potions, and the Wither will not attack them. Also, (with the exception of the Wither), they may spawn naturally with armor/items and/or pick up items and/or may have the ability to pick up armor/items.