in the Mediterranean with the intent to sell Piper and Hazel to Circe, kill Jason, and then give Annabeth and Percy to Gaea. Chrysaor battles Percy on the deck of the Argo II. Once Chrysaor's crew abandon him, Frank and Percy surround him. Chrysaor is knocked off the Argo II by Frank and Percy and Chrysaor falls into the sea. His ship, golden mask and loot are claimed by the Argo II crew who then sacrifice it as an offering to Bacchus. Circe – Circe ran a magical beauty boutique in the Sea of Monsters, where she went by the alias of "C.C.". While she treated females at her spa, she turned males into guinea pigs. When Percy was turned into a guinea pig, Annabeth used multivitamins from Hermes to restore him, and together they defeated Circe. In The Heroes of Olympus series, it is revealed that Circe employed Reyna and Hylla after they left Puerto Rico and treated them nicely, at least until the pirates were freed and proceeded to capture the sisters. Daedalus/Quintus – Architect of the Labyrinth, Daedalus is the son of Athena and the father of Icarus. He killed his nephew Perdix but escaped eternal punishment by casting his soul into automatons. Athena branded him with a murderer's brand in the shape of a partridge. In The Battle of the Labyrinth, Daedalus appears under the alias of a Camp Half-Blood worker named Quintus (meaning "the fifth" in Latin). Percy and Annabeth convince him to use his technical genius to help defeat the Titan army in the Labyrinth. He then accepts death, willing to Annabeth his laptop filled with thousands of years of notes and ideas. In death, he becomes the Underworld's architect and is allowed to visit Icarus and Perdix on weekends. Annabeth subsequently puts Daedalus' laptop to great use before it is lost in The Mark of Athena. In The House of Hades, Daedalus' Labyrinth is restored by Pasiphaë. Eurytion – A son of Ares who works on Geryon's ranch. He appears in The Battle of the Labyrinth and helps Percy and Annabeth locate Hephaestus. Halcyon Green – A son of Apollo gifted with prophecy and under "house arrest" for revealing to a young woman her fate. He gives his life to save Luke Castellan and Thalia Grace from the Leucrotae and his burning mansion in The Diary of Luke Castellan (part of The Demigod