Minecraft wiki entry for Combat, associated text: Currently, all Nether mobs are hostile, with the exception of the zombified piglin, which are neutral, and the strider. All can be very dangerous without sufficient weapons, but all can be outrun fairly easily while sprinting, and all despawn on peaceful. These nether mobs are immune from fire damage, making Fire Aspect and Flame enchantment useless. Piglins and Hoglins aren't immune to fire damage.