Mankind's fate hangs in the balance as the siege of Terra intensifies. With outer defences breached, Rogal Dorn commands the Palace's final stand against Horus' overwhelming forces. His opponent, Perturabo the siegebreaker, proves a formidable match, driving a brutal war of attrition. Control of the Lion's Gate spaceport becomes the pivotal prize—whoever holds it can unleash devastating firepower on Terra itself. As Dorn marshals every tactic to defend the gate, internal threats and otherworldly horrors emerge from the shadows. Can the Imperial forces endure against enemies both seen and unseen? Written by Gav Thorpe

Written by Gav Thorpe