Horus Lupercal, Warmaster of Chaos, is dead, and the Traitor Legions run from the wrath of the loyalists. Amongst them, Commander Arken of the Sons of Horus gathers on his ship an army from the ranks of all renegade Legions, and begins to plan his vengeance against the Imperium of Man ...

Inspired by the great Dornian Heresy of Aurelius Rex, here is an alternate timeline to the Warhammer 40000 universe, where Guilliman turned traitor instead of Horus, and led half the Legions in rebellion against the Emperor. The Index Astartes are done for all Legions. Now, the Times of Ending have begun ...