In Warhammer 40k, the Imperial Guard go up against insurmountable odds,  facing down the forces of chaos, Tyranids, Aeldari, and worst of all,  renegades. How do the fighting men and women of the Astra Militarum  maintain their calm in the face of the horrors of the galaxy? By having a  Commissar standing behind you.   Some Commissars are different though. They lead, the improve morale not  through threats, but through sheer charisma. These are the greatest  Heroes of the Imperium. Commissar Ciaphas Cain, Sebastian Yarrick, and  Ibram Guant.