In the 30th millennium, the first cry of the youngest god of the High Heavens dispersed the turbulence of the Warp. A brief period of calm followed, but the Warp was ravaged by the Iron Rebellion, Warp storms, and the isolation of human worlds. Xenomorphs took advantage of the chaos, threatening humanity's survival. At this critical juncture, the great Emperor unified Holy Terra, the cradle of humanity, and led 20 Space Marine Legions on the Great Crusade. Humanity's destiny was rising. A Warhammer enthusiast from the 2K era, Yun Lei, transmigrated into the body of the young Primarch, Clarke. Would humanity's fate unfold as the Emperor had envisioned?