The Emperor of Mankind has survived his confrontation with Horus, only to be split from his group of trusted supporters as they attempt to make their way to the last peaceful place know to them. Split through time by a creature with a power none of the group has seen before, it is only as the 41st millenium begins to come to a close that they can reunite around the Emperor. On a planet where no humans roam... And the twin Primares Celestia and Luna have only been re-united for a year after Luna's banishment to the Warp...