Aboleth
Aquatic Aberration with impressive psychic abilities. Can Dominate, as well as force you to lose the ability to breath air. Creators of the Skum, descendants of humanoids slaves that are enthralled to the Aboleth. Also, their species is older than the world and the gods themselves, and they can back up that claim thanks to their ancestral memory. The only thing they don't recall is the genesis of the Mind Flayer species, since they're from the distant future, so of course this disturbs the Aboleths who have no idea where the fuck they came from.