The world of Warhammer is a realm of darkness and despair. The Emperor's grand plan suffered severe setbacks from the very beginning of the Great Crusade: the stubborn resistance of Terra's warlords, the betrayal of his trusted right hand, and the gene-flaw mutations that the Legions of Astartes could not escape. All these things cast a shadow over the nascent Great Crusade.
Konrad's madness, Sanguinius's wings, Angron's Butcher's Nails, Lorgar's fervent faith... The Primarchs' gradual return brought the Emperor no comfort. The works he had painstakingly created had been brutally and violently altered, and the failure of key pieces on the board only deepened his unease.
The board was slipping out of his control. The seeds he had sown for humanity were bearing fruit to humanity's detriment, while the betrayal of two Primarchs and their Legions made it clear to humanity's guardian that he had to act ahead of time.
Yet just as everything was about to succeed, the forces behind the curtain quietly intervened. With a mere flick of their fingers, they effortlessly turned the Imperium's fist back against it. The Horus Heresy destroyed everything, and centuries of planning came to nothing. Darkness completely shrouded the future...
In the 40th millennium, after ten thousand years of erosion and the Imperium's deliberate efforts to destroy and conceal the truth, countless facts lay buried. The scorching fires of promethium consumed anything that might have plunged the Imperium into turmoil. It was a necessary evil.
But if someone could return to that earliest moment, if someone could change everything, what would become of the Imperium and humanity?
