Minecraft wiki entry for Wither, associated text: The wither has the greatest natural health of all mobs in Minecraft (exceeded by the warden in Java Edition 1.19, while Bedrock Edition's wither still has the highest health), at 300 × 150 in Java Edition or 600 × 300 in Bedrock Edition. The wither is immune to fire, lava, drowning damage, and freezing. Like other undead mobs, the wither is harmed by the Instant Health effect and healed by the Instant Damage effect as well as affected by weapons with the Smite enchantment. It is immune to all other status effects, like the ender dragon.