Curse of the Golden Scales
Cult of the Dragon
Some faiths hold that dragons are destined to rule the world, but the Cult of the Dragon takes such beliefs to an extreme: Only undead dragons are truly immortal and deserve that role. The cult helps fate along by influencing dragons to become dracoliches, which the cult refers to as Sacred Ones. Cultists idolize dragons as nearly divine, and more than a few dragons take up the cult’s offer of immortality.
-Forgotten Realms Campaign Guide