In touring Camp Half-Blood, Percy learns that Brunner is the camp's trainer and the mythological centaur (half-horse, half-human) Chiron. He also finds out that his father is the god Poseidon. He meets Luke Castellan (Jake Abel), the son of Hermes, and Annabeth Chase (Alexandra Daddario), the daughter of Athena. While at the camp, Percy learns that water has the power to heal his injuries, and allows him to use his magical abilities.