Publisher's blurb: It's a familiar seen to any gamer - a party geared up and ready for a long road ahead stands at the mouth of a cave and makes its final preparations before descending into the bowels of the earth. And while a prepared game master may have a map of the cave and some notes on the monsters and treasures contained therein, how much does he know about the cave itself? What kind of rock is it made of? Is there any natural mineral or gem deposits?