In the city of Waterdeep rests a tavern called the Yawning Portal, named after the gaping pit in its common room. At the bottom of this crumbling shaft is a labyrinthine dungeon shunned by all but the most daring adventurers. Known as Undermountain, this dungeon is the domain of the mad wizard Halaster Blackcloak. Long has the Mad Mage dwelt in these forlorn depths, seeding his lair with monsters, traps, and mysteries—to what end is a constant source of speculation and concern.
• The follow up to Waterdeep: Dragon Heist, Dungeon of the Mad Magetakes adventurers deep into one of D&D's biggest dungeons. Each of Undermountain's twenty-three levels is an adventure setting unto itself, and the book includes a map for each one.
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