violent and for refusing to take part in the ancient fight against the gods and Hercules. Percy and Annabeth encounter him in Tartarus when Iapetus (Bob) brings them to his lair. When the personification of Tartarus arrives near the Doors of Death, Damasen confronts him with Iapetus so that Percy and Annabeth can escape back to the living world. In The Tower of Nero, Iapetus is believed to have survived his presumed demise and is calling out to Nico for help, suggesting that Damasen may have survived as well. Enceladus – A 30 ft. Gigantes with green legs. Enceladus was the first Giant to be reawakened in the Heroes of Olympus series. He opposes Athena/Minerva. In The Lost Hero, Enceladus is killed by Jupiter and Jason as the Giants can only be killed by a god and Hero working together. In The House of Hades, Enceladus re-enters the world through the Doors of Death. He is presumably killed once again during the final battle in The Blood of Olympus. Ephialtes and Otis – Twin 12 ft. Gigantes that look somewhat more human than most of their brothers since they each have two snakes for legs, which are usually hidden under their black pants. They both oppose Dionysus/Bacchus. Ephialtes and Otis are awakened in The Mark of Athena by Gaea. Ephialtes and Otis manage to capture Nico and were tasked by Gaea to kill all demigods of prophecy but two, whom they are to bring to her. They fight Jason and Percy who defeat them with the help of Bacchus. In The House of Hades, Ephialtes and Otis return to the living world through the Doors of Death. They are presumably killed once again during the final battle in The Blood of Olympus. Hippolytos – The 30 ft. Messenger of the Gigantes with orange legs. He opposes Hermes/Mercury. Hippolytos makes a minor appearance in The Blood of Olympus. Mimas – The 25 ft. Gigantes with charcoal-colored legs. He opposes Hephaestus/Vulcan. Mimas makes a minor appearance in The Blood of Olympus, where he tries to kill Annabeth Chase and Piper McLean but he is killed instead with the help of Phobos. Orion – A 20 ft. Gigantes who opposes Apollo and Artemis/Diana. In The Heroes of Olympus, Orion is sent by Gaea to hunt down Nico, Reyna Avila Ramírez-Arellano, and Gleeson Hedge throughout their journey of bringing the Athena Parthenos from Greece