In an alternate world where the Roman Empire never fell, Rome reigns supreme in AD 1924, with steam-powered warships and eterium—a powerful energy source—fueling its dominance. But reliance on this energy has awakened the Shadows, ancient forces that feed on fear, ambition, and Rome’s buried past.

Marcus Domitus, a seasoned commander haunted by visions of collapse, is sent to quell unrest on the northern frontier, only to discover the Shadows are more than myth. They manifest as regrets and failures, threatening not only the empire but Marcus’s sanity.

Joined by his friend Gaius Varro and engineer Seneca, Marcus must confront both external enemies and the darkness within. As the Shadows grow, he faces a choice: save the empire—or let it fall to rebuild something new.