Dungeon's
I stole this idea from another game "sky-something" top game play like this game but they had lvl dungeons lvl 1 was a cave and you had to march from city to city killing units be about 5 villages or more in all and the last village be a boss with more units than any of the other citys and if you win all the citys within a time zone appx 4hours or so you get gold coins also it goes up to lvl 10 like oasis and you could sell more time for dungeons in your coin market (also way to get pres and coins for winning battles) and retreat when you want and come bk in another 24hours after first try