Waterdeep: Dungeon of the Mad Mage

Waterdeep: Dungeon of the Mad Mage is a 5th-edition Dungeons & Dragons adventure that takes place in the dungeon of Undermountain, located under Waterdeep. it will follow the Waterdeep: Dragon Heist adventure through levels 6‒20.

Blurb
"Explore the mega-dungeon of Undermountain in this adventure for the world's greatest roleplaying game."