Years ago, the Iron Warriors left Barabaras Dantioch, a crippled warsmith, on the world of Lesser Damantyne. Now, having declared their allegiance to the traitor Horus, they have returned. As the planet's garrison prepares for war, Dantioch must choose between loyalty to his legion or to the Emperor.

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Loyalist traitors! Iron Warriors battle Iron Warriors, and Barbaras Dantioch, a very important character in the Horus Heresy, is introduced.