On the forge world of Morod, the machines never stop and the work never ends. The population toils in the mines and factoria to protect humanity from the monsters in the void, while the Adeptus Mechanicus enjoy lives of palatial comfort. Genetor Gammat Triskellian seeks to end this stagnant corruption. When he learns of a twisted congregation operating within the shadows, one which believes that the tech-priests are keeping people from their true salvation - a long-prophesied union with angels - he sees in them an opportunity to bring down Morod's masters and reclaim the world in the name of progress. But sometimes, the only hope for real change lies in the coming of monsters.