Well, My mage and my necromancer (both lvl 90) tried to duo this monster and just couldn't take her. No spell I cast on her would land so it just became a kjlkj pet fight which lasted for 20 minutes before both my merc clerics were out of mana. Let me know if you find some winning strategy on it. It did seem that the fabled poisoned flames were directional so keep your pet focused at least at a 90 degree away from you.