Boccob

Boccob was the god of magic, arcane knowledge, balance, and foresight. During the War of the Gods, he worked with Wee Jas to create a spell that would destroy Nerull and end the war. Wee Jas allowed Nerull to kill her and take her soul, which Boccob used as a conduit for the spell, creating a catastrophic explosion that destroyed Nerull and seemingly destroyed Boccob himself as well. Prior to his death, he named Ioun as his direct successor as Lord of All Magic.