The word 'sovereignty' might not have been invented by the people in the spirit weapon world, but they already had this concept, and it was very strong. Because of the war that happened every year, there were too many city-states, so each city-state placed a lot of importance on sovereignty. It could be considered a friendly city-state between two people. They would have some exchanges with each other, but there would be very few military exchanges. They would not let the other party's Army enter their territory and station there, let alone an Army of ten thousand.
An Army of 10000 strong. If such an Army was stationed outside of River City, Lu Jinyan would never be able to sleep again if River City was not at ease with the bewitching City State.