Former queen of the illumin people
Alisther was the queen of the illumin people in Eva's stead throughout the Era of Culling and Era of Heroes, until they became the avarta and she passed leadership to the Animus Sisters. No records of her exist before she stepped in as leader of the illumin, and she was not illumin herself. And as mysteriously as she appeared, she has disappeared.
To those priviledged enough to have the knowledge, such as the Animus Sisters, Alisther is the mate of Liambic, and hails from another world.