Every round one team will have a king (a randomly selected person). Team with a king will know who the king is, he will have to stand out somehow, possibly different coloured name or whatever. So game mode is very simple, one team will have a king and will need to protect him from dying for like 5min or whatever, other teams task is to kill a king within the time, as well as that other team will not know who the king is so they will need to guess.
I think this type of game play could be awsome fun, as one team will be trying to protect 1 person from dying while other team will try to find the king and kill him.
At the end when a team kills a king next round they will have a king and other team will have to kill him. This type of gameplay will have same gold/exp system as siege/battle.
/Discuss