Silvia is a witch of the Darklight Tower Coven and aspires to become a hagraven, thus parting with a bit of her humanity. She is in possession of the Staff of Hag's Wrath. Illia is her daughter and only child.
Illia determines that, because of the acts Silvia has committed out of her desire to become a hagraven, the woman must be stopped. She asks the Dragonborn to help her slay her monstrous mother. Upon meeting Silvia, the Dragonborn must pretend to be a victim for Silvia's initiation to become a hagraven, but will be forced to fight her when the time is right.