A certain lord may favour heavy infantry, but overall have weak arches. Meanwhile, another lord is the opposite, with maybe even some unique troops. Every faction leader could have unique troops, ie a Kingsguard. Heavily armored knights for Vlandia, Varangian Guard for the Empire, etc. Then some lords, perhaps only the most influential ones that own a city and is a clan leader can have a unique troop, to highlight their preference. If their army prefers heavy infantry, give them a unique heavy infantry unit they will only have a small amount of, but be extremely deadly. With these things, lords can form alliances, and coordinate joint assaults, instead of just assembling an army every 10 minutes in game. A lord who prefers heavy infantry, but have weak archers, may form an alliance with a lord who has good arches, but weak infantry, meaning they wont form an army, but they will walk closely together, and raid together. Protect one another, and fight side by side. It would make the l