Myriad (The Horus Heresy #Short Story)

Mars, the red planet, home to the Adeptus Mechanicus, a mysterious cult dedicated to unlocking the secrets of the universe. In this sequel to Cybernetica, a loyalist resistance made up of rag-tag survivors from Titan crew, enginseers and tech-adepts, conducts guerrilla raids on the Dark Mechanicum forces of Kelbor-Hal. Out in the wastes, they discover a Kastelan robot that carries inside itself a rare secret – a technology that has the power to break the stalemate and swing the war in the loyalists’ favour. But what is the cost of deploying such a power? The loyalists now face a hard decision – just because they can, does this mean they should? Read it because
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It's the sequel to Cybernetica and picks up a vital plot thread from that novella, asking a question that echoes through the Horus Heresy – is it right to use darkness to fight darkness?