Rider-class Servant introduced Fate/Grand Order's Chocolate River no Sono Saki ni event. She was a princess of Aethiopia who was chained to a rock by her parents as a sacrifice to the sea monster Cetus, only to be rescued by the hero Perseus. She utilizes the facts that "Andromeda was chained to a rock" and "Cetus was turned to stone" to summon Cetus as her Noble Phantasm.
