to open locks with his mind, inherited from his father, he is an excellent swordsman. He receives a sword named "Backbiter" from Kronos at the end of The Lightning Thief. It is later reforged as Kronos's scythe and has the ability to harm both mortals and immortals because of its double edged blade, half steel, half celestial bronze. From Halcyon Green, he receives a diary he later entrusts to Chiron, and a celestial bronze knife he later gives to Annabeth with a promise to always remain her family. From his father he receives magic flying shoes, which he later curses and gives to Percy, but Percy gives the shoes to Grover. Just before giving himself over completely to host the spirit of Kronos, Luke bathes in the River Styx and obtains the invincibility of Achilles. Thalia Grace Thalia Grace is the daughter of Zeus and Beryl Grace, a TV starlet. She is seven years older than her brother Jason Grace and appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Last Olympian, The Lost Hero, The Blood of Olympus, The Dark Prophecy and The Tyrant's Tomb. She is portrayed by Paloma Kwiatkowski and Katelyn Mayer as the young Thalia in the second film. Due to her mother's abusive nature, Thalia had considered leaving home since she was little, but stayed to protect Jason. When Jason was seemingly stolen during a visit to Sonora, Thalia finally ran away and stayed on the run with Luke and Annabeth until they met Grover the satyr when she was 12. When they reached camp, Hades sent a horde of hell hounds that Thalia held off, sacrificing herself for her friends. Zeus pitied his daughter and turned her into a pine tree; her spirit then provided a magical barrier around the camp, keeping mortals and monsters out. Seven years later, she is purged from the pine tree with the Golden Fleece, which was applied to save it from poisons that were destroying the magical barrier protecting the demigods. At the end of The Titan's Curse, she becomes the lieutenant of the Hunters of Artemis, which freezes her age the night before her 16th birthday and prevents her from being the child of the prophecy. Thalia has bright blue eyes and short, spiky black hair, and wears black eyeliner and punk style clothing. Jason describes her as having a Mediterranean complexion. Annabeth