monster from Greek mythology, eldest of the Gorgons

Stheno is a gorgon in Greek mythology. She has 2 sisters. She and her sister Euryale was immortal, and the third sister Medusa was mortal. Medusa is the queen who turns people to stone with her eyes. Euryale could jump high. Stheno was very strong. She had snake hair, metal arms, and wings. She was the daughter of Phorcys and Ceto.