A Horus Heresy novel
Censured at the Council of Nikea for his flagrant use of sorcery, Magnus the Red and his legion retreat to their homeworld to continue their use of the arcane arts in secret.
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One of the most tragic tales of the entire Horus Heresy unfolds, as the Thousand Sons are brought low by their relentless quest for knowledge. Magnus is sure that he knows better than the Emperor, but isn't that what caused Horus to fall as well?