I think can be a good idea do a "duel" system between guilds and fight in cities, in this way a guild can challenge to a enenmy guild and fight in the city.
This duels must don't give bags, royals tokens, RR etc. this is only for fun between guilds. In this way, the guilds can make very impresive WBs and date for fight among themselves without waiting for the front advance for city.
Imagine 2 full WB level 80 and full sov, fighting each other, this can be awesome
