The Battle of the Labyrinth
Daedalus/Quintus: The inventor of the Labyrinth and son of Athena, who makes five automatons to cheat death. He becomes the new swordsman at Camp Half-Blood under the name Quintus. He has a murderer's mark on his neck branded by Athena because he killed his nephew, Perdix. He owns a Hellhound named Mrs. O'Leary. After his death, he builds toll-ways and other buildings to control traffic in the Underworld and according to Nico, Daedalus is very happy with this job. Before he dies, he gives Annabeth a laptop containing all of the works he never had time to accomplish as well as many of his ideas and theories.