『Roux Cristasse』

A three hundred-year-old witch girl with a semi-sentient mystical staff of Luden that can take on different forms and supposedly eats other witches who touch it by absorbing all of their uniquely powerful magic into itself, thus killing them in the process. Professor Loux agrees to escort Saybil on his mission, in hopes of getting to read the renowned yet dangerous Grimoire of Zero, or meet Zero herself. How she was given longevity and perpetual youth remains a mystery. She was great friends with Sorena the most high Mooncaller Witch until her wrongful demise by pyre.