I have an idea about war system, what if loser country become vassal country? And they must pay approximately 30% tax to winner country. Vassal country can send his army to help his liege if they are on battle, but vassal can ask his liege for help improving his country, for example repairing Crysthaven or Sinasoka village.
I know many players want conquering other country land, but of course ruler of loser country will be dethrone or being executed on conquer mode. I don't want dethrone Chiyo sisters, Queen Varea and Queen Apelia.
This is just my idea, the decision is up to you :)