Caenis is a powerful and enigmatic character from the Fate/stay night universe, part of the broader Fate series. Originally a figure from Greek mythology, Caenis was a Lapith warrior who was transformed into a man and granted invulnerability by Poseidon. In the Fate series, Caenis appears as a formidable Servant, embodying both their historical might and a deep-seated desire for revenge against the gods who wronged them. Fierce, proud, and driven by a complex blend of ambition and resentment, Caenis plays a pivotal role in the story, challenging both allies and foes with their formidable presence.