Xanthus

Xanthus is a horse possessed by [Achilles](https://anilist.co/character/129412), manifesting as one of his mounts when summoned as a Rider-class Servant. Xanthus possesses the ability to speak. Although rarely choosing to speak, he picks the most inopportune moments. Described as "truly unpleasant," he enjoys telling Achilles when he has fallen into a dangerous situation.