Nergal (deity)

Nergal was the Untheric deity of destruction, pestilence, the harsh aspects of the sun and also presided over the realm of the dead. He was killed during the Orcgate Wars.

Nergal was also a powerful outcast devil in Avernus that attempted to steal Mystra's secrets from Elminster by visiting horrendous suffering on his physical body all the while stealing memories using a mental link.