In the greatest betrayal the universe has ever known, the Warmaster Horus – once humanity’s greatest general, now corrupted by Chaos – has turned against the Emperor and hurled the Imperium of Man into ferocious civil war. The galactic conflict has risen to its climax. The Warmaster’s ruinous legions have assaulted Holy Terra itself, the Emperor’s seat. Here the fate of humanity hangs in the balance during the greatest military campaign ever seen...

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