Cult of the Dragon
Cult of the Dragon — a widespread cult active for many thousands of years. This cult believes that dragons are the highest form of life, so high as to be elevated to objects of worship. The cult seeks to spread the worship and rulership of dragons, and sometimes convinces dragons — always simple, never true — to undergo a ritual to become dracoliches.
The Cult has allied with the aboleth of the Lowerdark's Sunless Sea. They are corroborating on the construction of a mighty artifact of evil, the Tower of Domination. When completed, it will greatly magnify the domination ability of that ancient race of aberrant monsters.
The aboleth plan to conquer many Underdark races, and even extend their dominion to Surface lands. The upper echelon of the Cult of the Dragon believes, perhaps arrogantly, that their might is sufficient to prevent their erstwhile allies from double-crossing them. Perhaps they can ultimately even wrest control of the completed artifact from the aboleth? But if not, the Cult is content and secure in its belief that it will rule the Surface races as the aboleths' governors.
Those in the cult who think thusly are woefully naive with regard to the might of the aboleth, and of their powerful suasion and alliance with many illithids.