Really? Face rolled him with my sorc but he was a harder challenge with my NB because I had zero ranged abilities (noob 1st time levelling error) but still managed ok. You just have to keep moving and use the pillars to your advantage. make him have to move round them to get to you. Keep out of his main attack and pile in just after he lands it because he takes a few seconds before he starts moving again. He has zero health regeneration so it doesn't matter how much damage you do really as long as you keep it steady and don't take damage, or at least less than your dealing
Stay out of close combat and red
equip resto staff
dps is irrelevant, kite him to death
Block blue shots from titans, they reflect to them and kill them
Stay out of close combat and red