The time has come for Leman Russ, Primarch of the Space Wolves, to fulfill his oath and try to stop the Warmaster before he makes his way to the Solar Segmentum. Despite the opposition of three brother Primarchs, Russ leads the Space Wolves Legion from Terra and heads to the positions Horus with all possible speed. Reports from agents of Malcador Sigilite gave reason to believe that Horus had completely changed, and had merged with such diabolical forces that no man could resist him. A Fenris warrior will never refuse to fulfill this oath of his own free will, but given that Horus can no longer be wounded by mortal weapons, the Lord of War and Winter may have doomed himself to death for the sake of honor...