Azharul

Azharul was a dragon god who lived in Dragon Eyrie, reputed for his mastery of magic.

Description
His natural form was that of a fearsome, bad-tempered old dragon with many long, sharp projecting body-barbs.

Realm
Azharul realm was known as the Dragonspawn Pits, located in the Dragon Eyrie lowest region, the dark roots.

History
Azharul was an old rival of Tiamat in the draconic pantheon. For that reason, after Tiamat's realm in Heliopolis was discovered to be a hoax by members of the Twisted Rune, in 1371 DR, she mind controlled those members and with their aid killed Azharul on his realm and subsumed his divine essence, taking his body and divine realm, completely unbeknownst to anyone but herself.