Tyranny of Dragons
Tiamat, also known as the Nemesis of the Gods, was the queen of evil dragons and a servant of the greater god Bane. Like most other draconic deities, she was the offspring of the dragon creator deity Io. Tiamat was also the eternal rival of her brother Bahamut, ruler of the good metallic dragons.
Tiamat had one head for each primary color of chromatic dragon (black, blue, green, red, white), and each head had the powers of a member of the respective race of dragonkind.