(from the front cover) A recent earthquake has exposed an ancient ziggurat long buried in the earth. When the heroes are called to investigate, they find more than just a buried structure. The dragon-queen Tiamat was slain on this site, and the ziggurat was built eons ago to seal her taint. Now that it has resurfaced, evil magics flow into the surrounding lands! The heroes must descend into this ancient edifice, defeat the monsters that dwell within its bowels, and replace that seal that prevents Tiamat's evil from leaking into the world!