1.When you're on kingdom tag you lose at 1/2 rate so during wars when you walk all the way to other enemy grounds you don't starve on your way there.
2.During battles if you died you don't lose any exp but if you kill somebody you gain exp.
3.When you died and try to go back you can't hurt anyone until war is over.
4.Make gates that's breakable with like a health meter and people invading can throw rocks at it or use catapults to break it open and the defenders from the top can try and stop them by shooting arrows at them.