Crepus Ragnvindr, known as Master Crepus to some, is the biological father of Diluc and adoptive father of Kaeya. He is the head of the Dawn Winery. He and Diluc are descendants of the Dawn Knight Ragnvindr. Being biological family, Crepus bears a resemblance to Diluc, and both have long red hair. He also had a short, square-like red beard. Crepus wore a black coat, black gloves, a white chef-like coat, and red tie. He's a gentleman, but he's often rather cold and mysterious.