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Undead refer to mobs that are considered undead. Undead mobs share certain traits: they are healed by Potions of Harming and harmed by Potions of Healing, and the Wither will not attack them (the Wither attacks wither skeletons[Bedrock Edition only]). Most of them burn in sunlight, can pick up and use items, and all of them wear their own armor (zombies, skeletons, wither skeletons and zombie pigmen can wear actual armor, zombies, zombie pigmen and withers have extra natural armor, and withers have their shields they use when below half health)