Weapon 8d8 physical, Gaze attack 8d8 cold, Cast 8d8 cold, Explode on death 88d1 cold
An ancient of ice:
The ancient of ice is a slow but powerful demon in dNetHack.
In addition to a high-damage weapon attack, it uses cold-themed monster spells and a gaze attack that deals cold damage. When destroyed it explodes in a freezing blast.