Irfelujhar is an extremely powerful and ancient lich famed for his ability to craft rituals of incredible power. He is served by Mornujhar, one of Tiamat’s most trusted and powerful servants. Irfelujhar originally worshipped Vecna, but Tiamat seduced him away from the Lord of the Spider Throne. Shortly afterward, Irfelujhar’s lair disappeared along with much of the surrounding woodland.
The Fancy Bastards caught up with Irfelujhar during the events of the Grasp of the Mantled Citadel and defeated him. They discovered that he had crafted the ritual that was to destroy Bahamut, but were unable to locate his phylactery.