The Unremembered Empire

In the isolated realm of Ultramar, Primarch Roboute Guilliman unites loyalist forces in Macragge, contemplating humanity's future after surviving the Word Bearers' assault on Calth and the Shadow Crusade. As war fervently engulfs the galaxy and fugitives flood into his domain, the lines between ally and adversary blur, casting doubt on Guilliman's intentions amidst the threat of impending chaos and the looming shadow of Warmaster Horus.