Minecraft wiki entry for Achievement_guide, associated text: Ravagers spawn during the 3 waves in raids. These mobs have 100 × 50 and have high melee damage. It's recommended to defeat these mobs from a distance as blocking with a shield can stun ravagers and cause them to roar, knockbacking and dealing damage to nearby mobs except for other illagers. Since this mob can only use a melee attack, build a 3 block pillar and shoot the ravager using a bow or crossbow until it dies.