 An excellent mechanic, he repairs a bronze dragon running wild in the camp's woods, naming it Festus (which means "Happy" in Latin).Inspired by a blueprint in Bunker 9, an abandoned bunker in the camp's woods, and a picture he drew in his kindergarten time, he also creates the "Argo II", the ship the 7 of the Great Prophecy sail on to reach Greece.When Leo was eight, Gaia tricked him into burning down his mother Esperanza's machine shop in Houston resulting in her death.