They've got a Cave Troll.
You can have one, too. You can all have a Cave Troll! All you need to do is go to your LGS or the Fantasy Flight Games webshop and pick up a copy. Since, y'know, it's been released and all that.
In the game, the goal is to get as much gold a you can from the dungeon, but you must do it faster and better than the other players. You can keep your opponents from getting your gold by controlling the various monsters that inhabit the dungeon. Only the richest of heroes will make it out of the dungeon, so make sure you're carrying the most gold and keep away from those darn monsters.