**Potential End-game Spoiler**
I want to point out what I consider to be one of the largest issues in the end game, and I would like the developers to seriously consider changing this. When you defeat the three empires, each one you defeat falls in a way completely different to all other non-empire factions: their vassals go to other kingdoms instead of roaming the map endlessly. This sounds reasonable on paper, but here is the key problem: it allows the other empires to form armies more easily and readily. They essentially reap the benefits of your fighting, and all you really get are the settlements. These settlements will likely be captured by one of the very vassals which joined the opposition, making the gain moot. I propose that they simply move about just the same way as all other non-empire factions, or they choose to join your kingdom. Personally, I do not care which happens, but them just randomly joining the remaining factions creates extremely difficult situations for the player—none of which are enjoyable.