Minecraft wiki entry for Villager, associated text: Witches are hostile villager-like mobs that spawn anywhere in the Overworld in light levels of 7 or less, in swamp huts, as part of raids, or when a villager gets struck by lightning. Once a villager becomes a witch it cannot be turned back to a villager. Witches attack by throwing splash potions of harming, slowness, weakness and poison. They also use beneficial potions on themselves, especially healing potions when damaged, fire resistance potions if on fire, and water breathing potions if submerged in water.