This boss heals alot more than the normal serpent spawn. Also his waves and his beams are stronger than the normal ones, so you should stay diagonal to it. Knights should use Fierce Berserk and Blood Rage while avoiding waves and beams. Paladins should use Assassin Stars and Holy Missile while running around in the room. Druids and Sorcerers should use mana shield and Sudden Death Runes while running around in the room, from level 130 on you don't have to use mana shield.