Known to spawn at 725, 30, -144 (north room of the basement, PH "an ancient icewing". You have go thru the Chetari tunnels, to the upper right, to the fire area and then find the ice tunnel to the ice area.).
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".