Horus Heresy is the 2nd edition of the Warhammer 40,000 CCG. It has updated rules and focuses on the time of the Horus Heresy, one of the greatest events to ever happen in the Warhammer 40,000 universe. You take command in one of the bloodiest times of the Imperium, when brother has turned against brother. The Warmaster Horus has turned against the Emperor of Mankind and seeks to destroy him and all who follow him. You MUST choose which side you will fight for, and go to war.