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Explore Undermountain in this mega-dungeon adventure for the world’s greatest roleplaying game.

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.

Updated with Map Pins and Updated Dynamic Lighting in May 2026

Play with Less Prep on Roll20

Ready to play? Build unlimited 5e characters on Roll20 Characters!

• Plunge into the Undermountain’s depths with 26 adventuring maps ready for exploration with pre-placed tokens, map pins, and full Dynamic Lighting*
• Empower characters with 9 cards from the Elder Runes Deck, packed full of powerful boons and banes like immunity to negative conditions for 24 hours
• Reveal 18 clue cards from the Secrets Deck about Undermountain, the largest and deepest dungeon in the Forgotten Realms
• Surprise players with 30 transforming tokens you can flip to reveal an NPC’s monstrous side
• Roll to hit in one click with 340 monster and NPC stat blocks, including a menacing adult blue dracolich and sinister beholder zombie
• Drag & Drop over 80 magic items onto a character sheet to instantly arm your characters, such as the explosive wand of fireballs
• Click HERE for a full breakdown.

*(Subscribe to access Dynamic Lighting!)

Accessing Your Content on Roll20

Create a Game with Your Addon
Waterdeep: Dungeon of the Mad Mage includes an Adventure Addon. To create a new game with your addon, log into your Roll20 account and click on the "Start New Game" option from the site menu. Expand the Game Addons section in the Game Details page. Select the desired Addon by scrolling through the list or searching by name. Click the Add to Game button. When you launch the game, your Addon will be available in-game.

Accessing the Compendium
You can access all of the rules, items, and creatures from Waterdeep: Dungeon of the Mad Mage in and out of the game.

• In game
• On the web

Drag & Drop Art
You can access the Character Art Pack under the Premium Assets section of the Art Library in-app. These assets are only available for in-app use.

Which Character Sheet should I use?
This game uses the D&D 5E (Classic) by Roll20 character sheet.

Bug Report Thread
If you are experiencing any other issues, please let us know on the Roll20 Help Center.

DUNGEONS & DRAGONS, D&D, Wizards of the Coast, the dragon ampersand, Player’s Handbook, Monster Manual, Dungeon Master’s Guide, all other Wizards of the Coast product names, and their respective logos are trademarks of Wizards of the Coast in the USA and other countries. All characters and their distinctive likenesses are property of Wizards of the Coast. The materials described in this statement are protected under the copyright laws of the United States of America and around the world under international intellectual property treaties. Any reproduction or unauthorized use of the materials contained herein or artwork contained herein is prohibited without the express written permission of Wizards of the Coast.

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License: Roll20 End User License Agreement
(Personal Use Only, Do Not Distribute)