The Grand Hag
The seventh born child of a seventh born child grants great power to the daughter of a hag, but one ancient hag went further. She discovered the seventh born child of seven generations of seventh-born. A coincidence the child was unaware of. The hag stole this child away and devoured it, giving birth to a beautiful daughter of immense power. But this hag did not transform at her thirteenth birthday, she retained her human form, beginning to study magics and spirits. She learned new and strange magics and magics that were old even before the breaking. Some say that she knows powers even outside of the flow of magic.
But Esme Oggh was not interested in being social, or in the vile impulses of a hag. The grand aspirations of her mother were abandoned and Esme retired to the Faerie, found a place to build her home, and simply sought to live her life. Still, other hags seek her out, envious of her power and seeking her secrets. Hags hold her as her leader and serve her as faithfully as such creatures are able.
The grand hag resides in a simple cottage at the edge of a swamp, holding court within the warm interior from a cozy armchair. She has an assortment of descendants both in and out of the Faerie, both human and hag. And rumor has it she can see through the eyes of her bloodline.