Luke Castellan

Luke Castellan is the son of the Greek god Hermes in the Percy Jackson and the Olympians series. He holds a grudge against the gods, and is trying to awaken the Titan Kronos (a.k.a. Cronus) to destroy the Olympian gods. He wields a sword called Backbiter.

Before the Series
Much of Luke's early life is unknown, but two important events occured that developed his character, and his hatred for the gods. After finding out he was a half-blood (half-god, half-mortal), he journeyed with two of the eventual proagonists, Annabeth Chase and Thalia, to find Camp Half-Blood, a safe-haven for demigods. However, when they got there, they were attacked by monsters, and Thalia sacrificed herself to rescue her friends. Her father Zeus turned her into a pine tree to keep her from dying. An unknown number of years later, he was given a quest by Hermes- to steal a golden apple from the Garden of the Hespirides. He was given the quest, but scarred in the face by Ladon, the dragon that guarded the tree with the gold apples. Enraged that he was given a quest with no glory (because Hercules did it once), and his belief that the gods let Thalia die, he began to plot against the gods.

The Lightning Theif
When Percy Jackson, the son of Posiedon, arrives at Camp Half-Blood, Luke pretends to be his friend. When Percy gets a quest to retrieve Zeus's lightning bolt, Luke gives him a pair of winged sandals. Percy gives these to his satyr friend Grover because Zeus, who holds a grudge against Posiedon, will not let a son of Posiedon enter his "domain", meaning he is not allowed to fly. Later, the protagonists reach Tartarus, which was the pit where the gods cast their enemies. The winged sandals began to drag Grover to the pit because he was wearing them. Grover manages to get them off, and they escape before Kronos can pull them in. Later, after the lightning blot is retrieved, and Percy is back at camp, Luke admits to Percy that he stole Zeus's lightning bolt, framed Posiedon, and enchanted the winged sandals to drag the wearer into Tartarus. He sets a scorpion on Percy, which stings him. Luke leaves, and Percy is barely saved by the other campers.

The Sea of Monsters
Percy leaves Camp-Half Blood when he gets a quest to find the golden fleece when Thalia's pine tree is poisoned. He encounters Luke, who is captain of the Princess Andromeda, which is a demon cruise ship. Here, he tells the protagonists that every time a half-blood joins their cause, a piece of Kronos appears in the sarcophagus that is on their ship. The protagonists manage to escape the ship, and later get the golden fleece. Luke captures them again, and is enraged to learn that Percy sent the fleece ahead with another hero. Luke was planning on using the fleece to speed up Kronos's revival, and also admits he poisoned Thalia's tree. Percy challenges Luke to a sword-fight, and they escape again with the help of Chiron, Camp Half-Blood's director, and his gang of centaurs.

The Titan's Curse
Luke gets the Titan Atlas to join his side when he and his allies capture the goddess Artemis, and make her bear his burden- holding up the weight of the sky. He also plans on sacrificing the entrails of a creature known as the Ophiotaurus, to gain unlimited power over the gods. This plan fails when Thalia refuses to join Luke and sacrifice the Ophiotaurus, and the heroes, Percy, Annabeth, Grover, Zoe, and Thalia, free Artemis, defeat Luke, and force Atlas back under the sky.

The Battle of the Labrynth
Luke somehow manages to survive after Thalia presumeably kills him in the previous book. Now, he is trying to use Daedalus's labrynth as a way to transport his army into Camp Half-Blood and around the world. At the end of the book, Percy opens Kronos's sarcophagus (see The Sea of Monsters above), and finds Luke in it, with a piece of his chest missing. When Ethan, son of Nemisis, the goddess of revenge, joins the Anti-Olympian cause, Kronos is awakened in Luke's body. His sword Backbiter was reforged into Cronus's Bronze Scythe. However, Kronos was not fully accustomed to Luke's body, as seen when the mortal girl Rachel Dare throws a blue hairbrush at his eye, and Luke briefly regains his senses.

The Last Olympian
This book is currently unreleased, but by now, Luke has become the Titan Lord Kronos.