Moghedien

Moghedien is one of the Forsaken, the ancient and terrible enemies of the Light bound away for an age before their release. She is patient rather than showy, preferring webs of influence and quiet manipulation to open displays of power, watching from the shadows while others fight her battles for her.

She's a refreshing contrast to villains who announce themselves: Moghedien's whole method is caution, calculation, and self-preservation over spectacle, which makes her genuinely unsettling rather than merely menacing. Laia Costa plays her with a stillness that suggests enormous power kept deliberately, coldly in reserve.