The document describes the seven great demigod prophecies: Percy Jackson, son of Poseidon; Jason Grace, son of Jupiter; Annabeth Chase, daughter of Athena; Frank Zhang, son of Mars; Hazel Levesque, daughter of Pluto; Piper McLean, daughter of Aphrodite; and Leo Valdez, son of Hephaestus. Each demigod has unique powers and accomplishments. Together, the seven demigods must unite the Greek and Roman camps to gain the strength to defeat Gaea, the Giants, and their forces.