Great Mother (Zagreus)

 was the head of the Sisterhood of Karn, she could read Old High Gallifreyan, which was useful of Lord Provost Tepesh, when they entered Rassilon's Foundry. Even though she disliked Rassilon, she side with him once she found out that Tepesh and Ouida after they killed her fellow sister Cassandra. (BFA: Zagreus)