
In fact, it was he who sabotaged the peaceful negotiations precipitating the war between the Imperium and the Interex, by stealing an archaic Kinebranche Anathame sword from the Interex's closely guarded Hall of Weapons.


To achieve this outcome for his dark masters, just before the Imperial war with the Interex began during the final stages of the Great Crusade, Erebus began to have many secretive dealings amongst the Luna Wolves Legion and with the Warmaster in particular. Before long, the Ruinous Powers sought to act through Erebus to set their plan in motion to destroy the Imperium of Man and the greatest champion of Order in the galaxy which is of course the Emperor of Mankind. Several years before the outbreak of the Horus Heresy, Lorgar and Erebus had fully corrupted the Word Bearers to the service of Chaos, even going so far as to erect temples to the Dark Gods on every world they brought into Imperial Compliance. In any event, when his Primarch Lorgar grew angry with his father the Emperor after he was chastised on the world of Khur for trying to spread worship of the Emperor of Mankind as a divinity across the galaxy, Erebus explained to his master that there were other entities in the universe that were more than willing to accept his worship and the worship of other humans. It is unknown when exactly Erebus turned to the worship of the Dark Gods, though it may have happened when the Word Bearers joined with the Luna Wolves to pacify the world of Davin mid-way through the Great Crusade.
