Tharizdun

Tharizdun is a long-forgotten interloper god who seeks to destroy all that is. During the Dawn War he was imprisoned in a remote layer of the Abyss, from which he and his followers hope to set him free.

History
In 1340 DR, a cult of Tharizdun formed in western Chessenta. It hired bandits, consorted with demons, and caused much havoc before an alliance of forces destroyed it. Some credit the fact that Tharizdun did not gain a permanent foothold on Toril to the personal intervention of the goddess Mystra.

A new cult of Tharizdun was formed by the plague demon Murmur in 1479 DR after a burnt portion of its corpse was discovered by the Firestorm Cabal in Akanûl. It possessed Leheren, one of the members of the Cabal, and created a secret order within the order devoted to freeing Tharizdun and releasing him on the continent of Faerûn.