Known to spawn at 725, 30, -144 (north room of the basement, PH "an ancient icewing").
Every 20 seconds, picks a random target and casts either "Numb" (if pure melee) or "Curse of the Ancient" (if a mana-using class) on a random target. If you have "Curse of the Ancient" on you and cast a spell on Edoth the Ancient, Edoth AEs "Retribution".