Percy learns that Camp Half-Blood is a place for demigods like him. He meets a future friend, Annabeth Chase. He learns that Mr. Brunner is actually the centaur (half human, half horse) Chiron, the camp's activity director. He also learns that the director of the camp is the god Dionysus. He is introduced to Luke Castellan, the leader of the Hermes cabin. Later, in a capture-the-flag game, Percy single-handed defeats Clarisse, leader of the Ares cabin, and three others when he healed his injuries in water. This is when he learned that he is the son of Poseidon as a holographic trident appears over his head. Soon after learning that Zeus's lightning bolt has been stolen, Percy embarks on his first and eventually successful quest along with Grover and Annabeth to retrieve it.