Yielothax
Yielothax can be found in the following locations: In another dimension, through a portal in the Raging Mage tower, southern Zao.
Yielothax has 1500 hitpoints. It is immune to earth damage. It is strong against fire and death damage. It is weak against physical, energy, and ice damage. It can neither be summoned nor convinced.
Yielothax yields 1250 base experience points. Its loot can include small diamond, gold coin, talon, might ring, wand of cosmic energy, epee, brown mushroom, mastermind potion, strong health potion, strong mana potion, lightning pendant, lightning legs, shockwave amulet, broken ring of ending, yielowax, and yielocks.