The story behind the domain of the Eyeclops is told in three parts each describing an age of power where the Eyeclops and the denizens within thrived for a time. When do your players find this deadly and strange place? When it is merely the Lair of the Eyeclops? When it has become the Vault of the Eyeclops? Or when darkness envelops the Crypt of the Eyeclops? The adventure twists and turns based on the rise and fall of the strange cult rising up in the shadow of this fearsome monstrosity.