Waterdeep: Dungeon of the Mad Mage Maps and Miscellany

Publisher blurb:

Chart a course through the greatest dungeon in the Forgotten Realms in this accessory for the world's greatest roleplaying game.

Hundreds of years ago, long before Waterdeep was built, Halaster Blackcloak carved a vast dungeon beneath Mount Waterdeep and stocked it with all manner of creatures from across the planes. Though it is likely impossible to map out the entirety of Halaster's domain, the maps contained herein lay out the bulk of this deadly dungeon and are certain to lead you through many hours of play.