Luke Castellan is the demigod Son of Hermes and the mortal woman May Castellan. He is the longest-lived camper at Camp Half-Blood, and he is the head counselor of the Hermes Cabin at Camp. Luke came to camp alongside Thalia Grace, Jasper Rhodes, and Annabeth Chase, but he was unable to save Thalia when they were attacked by monsters on Half-Blood Hill. In response to Hades killing her, Luke betrayed the gods and has been secretly working with Kronos. He was the one who stole Zeus's Master bolt and Hades' Helm of Darkness. However, to get away with this crime, he convinced Ares, who discovered his theft, to keep the two items hidden and allow a war to brew.