Kronos, she commands an army of mythological figures and monsters dissatisfied with the Olympians. During The Blood of Olympus, she is defeated by Leo Valdez, Piper McLean and Jason Grace who lift her into the sky, charm her to sleep and then incinerate her with a mighty blast of fire combined with a shot from an onager by Octavian, a legacy of Apollo and the former augur of Camp Jupiter. As a goddess, she can't be killed, but her essence is scattered so much she will never able to form a consciousness again. Ourea – The primordial gods of the mountains and the children of Gaea. In The House of Hades, there were some Ourae that make up the Apennine Mountains. When the Argo II tries to cross the Apennine Mountains, the Ourae there attack them with boulders because they are loyal to Gaea. They hurl boulders from their mountaintops where they severely damage the Argo II. Leo Valdez has to turn the Argo II away from the Apennine Mountains to come up with a different plan. Akhlys – The goddess of misery, and a daughter of Chaos and Night. She is described as a miserable-looking old woman who carries the Aegis shield with Medusa's head carved into it. In The House of Hades, she offers the Death Mist to Percy and Annabeth, but later betrays them by luring them into Nyx's territory and trying to kill them with poison. In anger, Percy manipulates the poison back at Akhlys, causing her to run away in fear. This is the first time that Annabeth sees the darker part of Percy's personality. Keto – A primordial sea goddess and the sister and wife of Phorcys. In The Mark of Athena, Keto appears as a girl named "Kate" who is encountered in Phorcys' aquarium in Atlanta. When Gleeson Hedge discovers Phorcys' ruse, he frees Percy and Frank after knocking "Kate" out. After Percy, Gleeson, and Frank escape from the aquarium, Keto sends a skolopendra (shrimp monster - one of her children) after them. Nyx – The primordial goddess of night, said to be the oldest being in the universe besides Chaos itself. In The House of Hades, Percy and Annabeth accidentally wander into Nyx's territory and try to pose as tourists guided by a brochure that does not mention Nyx. Angered, Nyx shows just how important she is and summons her children, who