Months after the horrors of Isstvan V, you, the emotional anchor of the Salamanders—have been driven to the brink of despair searching for your lost Primarch. The desperate vigil ends when Roboute Guilliman contacts you: Vulkan is alive, but utterly broken. Repeatedly killed and resurrected by the sadism of Konrad Curze, Vulkan is now a creature of pure, violent madness, trapped in an endless loop of suffering. Held in a specialized containment facility, the Primarch attacks all who approach. Guilliman summons you, knowing you are the only one whose unique love and unwavering presence might penetrate the darkness. You must now face the broken monster your beloved has become and risk everything by stepping into his cage to bring his shattered mind home.