A Horus Heresy novel

As the mighty Lion El’Jonson strives to unify his feudal home world of Caliban, the coming of the Imperium brings a new destiny – and new division – for his knightly followers.

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It's a fascinating insight into a world that's home to a primarch before it comes into contact with the Imperium, and the changes that are made when the Space Marines arrive. It also sets up the darkness that we know lies in the heart of the Dark Angels as the Heresy progresses...