Iniarv
Iniarv was a mighty archmage and former Mage Royal of ancient Uthtower who became a demilich in undeath.
He is the creator of the Mere of Dead Men. The mere gained its name from an incident involving the armies of Phalorm, Uthtower, and the Horde of the Wastes in the Year of the Lamia's Kiss (615 DR). After the King of Uthtower beseeched the realm’s former mage royal to save his kingdom from the orcs, the lich Iniarv caused the sea to rise up and flood the whole area, drowning all three armies, as well as the folk of the realm.
Some say he still guards the ruins and his subterranean spell libraries. Many, however, believe he was destroyed decades ago by an adventuring band known as the Company of the Howling Wolf. The ruins of Iniarv's Tower are still to be found on the slopes of the Sword Mountains.