Right now there is not really any good catch up mechanics for kingdoms that fall behind, which can be infuriating for players in losing kingdoms, especially now that it is harder to get everyone on the same kingdom due to national power. So, here is a fun idea to make the game still fun for people in losing kingdoms.
At the end of every day the kingdom with the highest national power gets a prison building on a random empty spot in a random city controlled by with winning kingdom. This prison building will have no guards, so it is up to the players in that city to defend it. Each prison will have a random number of prisoners. Once a prison is destroyed the prisoners inside turn into units and start attacking random garrisons until all the prisoners have died fighting. For example: lets say a prison that has 300 prisoners gets destroyed. Then, all those prisoners get turned into 300 riot units. The riot units then attack a random castle owned by someone from the winning kingdom with as many units as they can field on a battlefield. After the battle, if any survive, they repeat and attack another random castle owned by someone in the winning kingdom.
Since a prison gets made every day it would get harder and harder for the winning kingdom to protect all their prisons, and they would have tough decisions of whether to defend their prisons or defend each other but suffer the rath of the rioting prisoners. Meanwhile, players in losing kingdoms would have some hope and something proactive to do, they would go looking for prisons that are undefended, or perhaps if all the prisons are defended it will be easier to attack an undefended players stronghold.
A few things about the prisoners:
-The strength of prisoner units depends on how long the server has been running, so they start off as mostly low level bronze units but end up as high level gold units.
-The number of prisoners in a prison will be visible to all, this way the defenders will know which prisons to prioritize defending and the losing kingdoms can plan which prisons they want to break.
-To ensure that there is always room for at least one prison to exist in the winning kingdom each city will have a designated spot where players can not place their castle and guard towers can not be placed.
-If there are no free spots in any of the cities controlled by winning kingdom when a prison is being placed, that prison is instead immediately destroyed and the prisoners inside it start attacking.
-Once a prison is created it is assigned to the current winning kingdom. This way if the winning kingdom tries do cheat the system in any way to lower their power for a little bit and not be the winning kingdom the prisoners will still attack them.
-If a city with a prison is dropped, all the prisons inside it get destroyed and the prisoners start immediately attacking.
-Once freed, the prisoners will prioritize attacking castles that are not in the capitol, but if there are no castles outside the capitol then the prisoners will attack castles in the capitol.
So yeah, what do you think?