If I become Holy Roman Emperor, I should have the ability to recruit special unique units with elite training and equipment. Actually, more than that, I should be able to carefully pick these soldiers from a specially selected pool of individuals who are the product of selective breeding and so on, to maximise strength, endurance, intelligence, and loyalty. And if I'm in good with the Pope, they should be equipped with holy weapons to fight my enemies (who would be, obviously, heretics and demons). I'm thinking we could call them "marines", though that seems to be lacking something, I admit. They could be organized into companies with names like "Children of the Emperor" and "Templars" and "Fists of the Empire" or something like that. And they could get bonuses to go on crusade. Oh, and unlimited morale, because duh, they're super soldiers fighting for the Emperor.