Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: Evokers live in woodland mansions, which are very rare. Due to their ability to summon vexes and their fang attack, they are very dangerous in Easy, Normal, and Hard difficulties. However, they cannot deal any damage if the player is on Peaceful difficulty (although the player may still incidentally receive damage from an evoker fang if an evoker is trying to attack a villager). Evokers drop very rare items upon death: 0–1 emeralds, and even more useful, a totem of undying. If the player dies while holding a totem of undying, that player will not die, but instead, have half a heart, and quickly regenerate to full health.‌[Bedrock Edition only]