harm. In The Tower of Nero, he continues to live at the Waystation and is stated to be adjusting well and to be heading up an elephant visitation program with Camp Jupiter. Medea – A sorceress and a granddaughter of Helios. Jason, Piper, and Leo encounter her in The Lost Hero, where she runs a mall in Chicago under the name "M" after being resurrected by Gaea through the Doors of Death. She becomes enraged upon learning Jason's name which he shares with her former husband, the Hero that recovered the Golden Fleece who left her. Her magic causes Jason and Leo to become hostile to one another. Realizing Medea is an agent of Gaea, Piper brings them to their senses and leads their escape before Medea can do anything else to them. In the process, Medea's mall is destroyed and she is killed in the explosion. Aphrodite later warns Piper that Medea will eventually return along with others due to the Doors of Death being opened by Gaea's forces. In The Burning Maze, a once again resurrected Medea returns and she is now working for Caligula. When she engages Meg in a charmspeak battle, she announces her plans to take Apollo's essence, combine it with her grandfather's leftover power, and make Caligula the new God of the Sun. Medea later appears in the throne room of Caligula asking him to perform the ritual after she trapped Jason and Piper in a tornado prison. When Apollo stabs himself, Medea and Caligula rush to perform the ritual before he dies. Her being focused on the ritual weakened the tornado prison enabling Piper to punch Medea. When Apollo reaches Herophile's holding area, Medea appears and prepares to extract Apollo's essence. Piper saves Apollo by stabbing Medea and pushing her into Helios' flames. Muses – The immortal daughters of Zeus and the Titan Mnemosyne, who inspired and preside over several creative arts. In The Lightning Thief, the Muses performed on Mount Olympus at the time when Percy returns Zeus' Master Bolt. As the gods celebrate, the Muses play music that sounds like anything you want, so no one argues about the music. In The Titan's Curse, the Muses perform their music after the Gods decide not to kill Percy and Thalia. According to Percy, everybody hears the music they only want to hear, like classical for the gods and hip hop for the