Minecraft wiki entry for Mob, associated text: Boss mobs are special hostile mobs that are distinctly more dangerous and tougher than other mobs. They do not spawn randomly, and are confronted intentionally. All of them also have a boss bar featuring their name and health. Boss mobs provide unique challenges but also equivalent rewards. Some players also consider elder guardians, skeleton horsemen, illusioners, ravagers, evokers, and piglin brutes as mini bosses.