Book 13: Nemesis
A Horus Heresy novel
After the horrors of Isstvan V, Horus declares outright war against the Imperium. In the shadows of the Emperor's Palace, powerful figures convene.
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The Horus Heresy is a war of Space Marine vs Space Marines, but other combatants lurk in the shadows... Here we see the precursors to Warhammer 40,000's Assassinorum temples in action, even as Horus despatches a monstrous assassin of his own.