"Riptide is deciphered from the Greek name, Anaklusmos. It is the prized sword of Percy Jackson that is made of Celestial Bronze, a material that is only deadly on gods, demigods, Titans, Giants, and monsters. It does not affect mortals, as it just passes through them harmlessly. The sword is a medium length xiphos (a greek one-handed double edged sword)." - Riordan Wiki
Galactic Cadogre