This quest will come directly after Bartender. You will go back to Gula's Archaeological Dig that was visited in Quest: Fat Chance. Enter here and go down into the dig sit and there turn the cup to the only troll statue without and item or the one farthest from the door. Once you turned it head back to where the troll was at.
Rewards for the quest are 6211 exp, 1300 gold, and one skill book with reward choices of 3105 exp, 1300 gold and 6 random items. Enjoy.