Would it be possible to change the amount of times you can hit a Barbarian city from 5 total, to per city? The bigger you are, city wise, the more res you need, and the more Crystal/amber you need. Will give incentive for players to grow bigger and stronger.
2=10 and so on. but only 5 from each city, not a grand total from one city...kinda like how you can have different seasons in different cities.