In the history of the Warhammer 40,000 universe there is no event as gloriously iconic, as galaxy-spanningly epic, and as horrifically tragic as the Horus Heresy. 10,000 years ago the Warmaster Horus-The Emperor’s most trusted lieutenant – turned to Chaos and plunged the Imperium bloody civil war. The Warhammer 30,000 universe is one of vast battles and huge wars with some amazing game play and scenarios to match.