Luke Castellan

Luke Castellan is the son of Hermes and May Castellan, one of the major antagonists in the PJO series. He was the head of the Hermes cabin at Camp Half-Blood, but was never able to forgive his godly parent what he did to him. So, Luke accepted the evil Titan lord Kronos’s invitation to join him to defeat the Olympian gods. He also allowed Kronos to take possession of his body, but in the end, he saved Olympus instead of destroying it with the help of Percy Jackson, a son of Poseidon. Luke was exceptionally young when he died - age 22.