After the horrors of Isstvan V, Horus declares outright war against the Imperium. In the shadows of the Emperor’s Palace, powerful figures convene, 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. Images are property of Games Workshop Group PLC