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The Abyssal Crusade was an Imperial Crusade undertaken in 321.M37. The judgement of Saint Basillius found thirty Space Marine Chapters lacking faith. The guilty Chapters were given a choice between death or embarking upon a great crusade into the Eye of Terror. All would choose the latter.

The Crusade met with disaster, and each of the Chapters that took part in it had their tale ended in great misfortune.

The crusade's mysterious and disastrous fate was kept hidden from the greater Imperium, and the Administratum denied any link to it and the increase of Chaos Space Marine raids shortly afterwards. All that is known is that 800 years after the Crusade began, the remnants of some of the judged Chapters returned from the Warp with their purity and sanity intact. Infuriated and embittered by their ordeal, they cast their sights on the legacy of Saint Basillius, the long-deceased figure now worshiped as a god.