Rule 1 Edited Headline . <| sep |> Many of them would have purposes . Lorgar , Magnus , Ferrus Manus , Vulkan , and Fulgrim would become great academics and help lead the scientific , technological , and cultural development of the empire , as well as Magnus powering the Astronomicon . Some like Russ and Dorn and Perturabo would become great administrators to help the empire run along smoothly and to make the Imperium an empire of thriving metropolis worlds , all the equals of Monarchia or Ultramar or Terra . The Lion might become heavily involved with imperial politics along with Guilliman , Horus , and Sanguinius . Kurze , Alpharius , and Omegon would run the clandestine services of the Imperium to ensure peace and prosperity within . Russ , Khan , the Lion , and Angron would remain primarily military leaders that lead the Imperium ' s many armies . They would probably each have one of the four segmentums of the Imperium under their direct command with the exception of Solaris . Of course , Horus would remain Warmaster and act as virtual secondincommand of the Imperium , and supreme commander of the Imperial military and Sanguinius would probably be his second in command and adjutant . The military would still have a purpose , because there woulds still be external threats like the ' nids and the Necrons and the Orkz and even assuming the Imperium could remove all possible external threats , they ' d still need a military to protect the Imperium from itself and put down rebellions . The idea that there would never bee a need for the military and for the primarchs to lead armies is just lunacy . Absolutely no idea about Mortarion and Corax .