Stheno is the eldest of the Gorgon Sisters from the Fate series, a divine spirit and immortal goddess manifested from men's longing. Unlike her sister Medusa, she lacks combat abilities, with weak physical strength unable to defeat an adult male. She serves as an Assassin-class Servant in the Holy Grail War, characterized by her ruthless personality and acceptance of her fated role. Visually identical to her sister Euryale except for a forehead tattoo, she embodies the archetype of a beautiful yet powerless idol deity.