The Enemy was the reborn Thinking Machine Empire, and the revealed malevolent force that directed the war against the Honored Matres and humanity, and was responsible for the Matres fleeing back into the Old Imperium. Since the Return of the Honored Matres caused violent upheaval and chaos to those who lived in the Old Empire, it was not initially know by peoples and groups of the Imperium; or remembered by the Matres, who or what is was the Matres were fleeing from.