Vecna, the Dread King of Oerth

Once a Human King

He was the only known son of a hag. Vecna forcefully became a god and was rebuked by the pantheon. The gods cursed him to wander the earth as a lich who ascended to godhood. While he was once considered the most powerful lich to dwell on Toril, over the ages he spent in undeath, Vecna became maligned across the multiverse and was considered the scourge of all civilization. According to some, Vecna had an obsession with acquiring and maintaining secrets, believing them to be the source of true power. He was precise and calculating in his actions, but was at times prone to bouts of intense rage. Vecna believed that every being in existence held a single secret that could be manipulated to bring about its destruction. Uncovering that secret and exploiting its truth was the key to gaining dominion over others. As a deity, Vecna did not claim a domain but instead wandered the entire multiverse. He maintained the Citadel of Cavitius, originally on the Quasi-Elemental Plane of Ash near the border to the Negative Energy plane, which he had wrested away from the Doomguard long before. The Citadel was used by Vecna as his fortress, which he visited regularly to gloat on the despair of his defeated enemies.   Finally having enough, The mortal powers that be banded together to rid themselves of this terror. After a long fight, Galbassi of the House of Virnai used a rapier forged of radiant light to weaken and ultimately seal Vecna the Dread King into an amulet specifically crafted for him, but not before cutting off his left hand and removing his right eye. The hand and eye are the only physical remnants left of Vecna and they cannot be destroyed by any known means.