Minecraft wiki entry for Defeating_a_woodland_mansion, associated text: Bringing a sheep from a nearby village or finding one around the mansion can be good for distracting evokers. Bring some blue dyes so you can dye the sheep blue. Bring the sheep in the mansion when you see an evoker. Dyeing the sheep blue can provide a distraction to the evoker and gives it a cooldown time before it could summon anything else.