Fourteen-year-old Romesus lives in a world governed by a mysterious Establishment that has brought darkness and poverty to society. He lives in a poor town where a wise and weathered man named Giovan tells him stories of a world that existed before a great Blackout wiped out all human consciousness. When Giovan mysteriously disappears, Romesus finds himself guided by a powerful spirit to search for the world that Giovan spoke of. The evil Establishment will do everything possible to stop Romesus and the Legends from coming together and reaching the City of Gath, where the Lost Book of X must be united. They must defend themselves against mysterious creatures and dark forces as they battle their way across deserts, swamps and underground worlds. In the City of Gath, they face the Immortal Army in one final battle to save humanity, and themselves.