You need to mine for gold to help prepare your kingdom for a battle between many kingdoms. The armies desperately need to fitted with all of their armor if they want to survive long enough to make it back home. You will be managing miners in Undermountain.. yep that's the name of your kingdom and you will have them all working under a mountain.. how fitting eh? Click the stones as the instructions tell you and build gold deposit to drop the gold into that the miners have collected. There are dangers down here though so keep a close eye on your miners.