The story follows up the events in Dan Abanett's novel Know No Fear. Calth is in ruin, but Word Bearer failed to bring down Macragge and destory the Ultramarine. Kor Phaeron was mortally wounded by Roboute Guilliman, Primarch of the XIII legion and was fleeting via Infidus Imperator. Guilliman sent Marius Gage, his second in command to hunt him down and avenge those who fallen in the surprise attack.
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