the name of a location where the Titans were imprisoned, there is a primordial god by that name as well. Through Gaea, Tartarus fathered Typhon and the Giants. His real form is the whole Tartarus itself, but he personifies himself in a form that stands several feet tall with a face of a swirling vortex and a voice that makes it seem going inward, rather than outward. In The House of Hades, the personification of Tartarus appears in physical form where he makes a remark about Gaea's awakening. Annabeth and Percy fight Tartarus until Iapetus (Bob) and Damasen sacrifice themselves so that Percy and Annabeth can get out of Tartarus. In The Tower of Nero however, Nico comes to suspect that Iapetus at least survived and that he has been calling out to him from Tartarus for help. Titans The Titans are the children of Gaea and Ouranos. Most of them fought against the Gods during the Titanomachy which ended with the Gods winning. Among the featured Titans are: Kronos/Saturn – The king of the Titans, the Lord of Time, and the main antagonist of the Percy Jackson and the Olympians series. He is the father of all the elder Olympians, as well as Chiron. He fights with a scythe with a six-foot-long magical blade that can harm both gods and mortals and was used to dismember his father Ouranos. Kronos is initially trapped in Tartarus, but eventually escapes to possess Luke Castellan. In this form, he personally leads the Titan army against Olympus. He is finally defeated by his own host, in fulfillment of the first Great Prophecy. However, Hermes states that Kronos can't be killed and is instead scattered so thin that he hopefully can never form a consciousness again, the same fate that later befalls his mother Gaea. In The House of Hades, the Titan Koios echoes this, telling Bob that while bits and pieces of Kronos' essence still remain, it is nothing that can ever be put back together again even with the help of the healing powers of Tartarus on monsters. In Percy Jackson: Sea of Monsters, Kronos is voiced by Robert Knepper. He was shown to have a gigantic, demonic body along with superhuman strength and the ability to use parts of his own body as projectile weapons. Rhea – The queen of the Titans, and the mother of the elder Olympians. Unlike Kronos,