From the introduction: Set in the far northeastern parts of the dwarven kingdom of Derl, this immense structure serves as a safe haven and entertainment facility to the eccentric mage Essidel. It was built by the mage's late grandfather, Mallan, by carving tons of stone by arcane means. The protective contraptions scattered throughout the dungeon are all powered by a raw magic vein (4). Intruders are expected to breach the dungeon through area 1, using a weak point in the cubical force field that envelops most of the location. A mysterious fog in areas 1, 2, 3 denies the heroes any teleportation spells they might want to use.