Vale of Darkness
Vecna was a powerful wizard who became a lich (someone who uses evil magical power to allow his or her continued existence after death in an undead state). He was eventually destroyed, and his left hand and left eye were the only parts of his body to survive. Even after he achieved godhood he is still described as missing both his left eye and left hand. Vecna’s holy symbol is an eye in the palm of a left hand.
Vecna is usually depicted as a powerful magician resembling a desiccated corpse missing his left hand and eye. A constant theme in the adventures in which the character appears is Vecna’s never-ending quest for power, ending, should he succeed, with Vecna as the only deity in existence. Vecna’s main foes in the realm of death and undeath are Kas, Orcus and the Raven Queen (though he would rather she rule the dead than Orcus). Among the gods, Ioun is something of Vecna’s antithesis, for she would share with the world all the knowledge he would keep secret.
Dragon #935 Vecna