{{DnDmodule||module_title=Waterdeep: Dungeon of the Mad Mage|image=File:Waterdeep, Dungeon of the Mad Mage.jpg|module_code=|module_rules=Dungeons & Dragons, 5th edition|module_character_levels=5-20|module_campaign=Forgotten Realms|module_authors=|module_first_published=20 November 2018}}Waterdeep: Dungeon of the Mad Mage is an adventure module for the 5th edition of the Dungeons & Dragons fantasy role-playing game. It is the second part of the Waterdeep storyline and follows the first adventure, Waterdeep: Dragon Heist. Plot summary Undermountain is the lair of the insane wizard Halaster Blackcloak who descended into madness as he dug deeper under the city of Waterdeep and expanded his domain. Many creatures overpowered by Blackcloak are contained in different levels of his lair along with multiple portals to other parts of the Forgotten Realms and the multiverse. Adventurers set off on an subterranean dungeon crawl that starts in the Yawning Portal tavern and explores twenty-three levels of Undermountain and the refuge of Skullport (which is both a connection to the seedier side of Waterdeep and to the Underdark). This is the first official published adventure with content intended for "tier four" (levels 17-20) in 5th edition. Publication history The new module was announced in June 2018 during the Stream of Many Eyes livestreamed event on the Wizards of the Coast's Twitch site. Waterdeep: Dungeon of the Mad Mage was released on November 20, 2018 as part of the fantasy storyline "Waterdeep". Waterdeep: Dungeon of the Mad Mage is available as a digital product through the following Wizards of the Coast licensees: D&D Beyond, Fantasy Grounds, and Roll20. A corresponding product, Waterdeep: Dungeon of the Mad Mage Maps and Miscellany, was also released. This product reprinted handouts and 26 maps from the book on 8.5" x 11" cardstock sheets designed for use with dry-erase markers. Reception In Publishers Weekly's "This Week's Bestsellers: December 3, 2018", Waterdeep: Dungeon of the Mad Mage was #18 for "Hardcover Nonfiction". Rob Hudak, for SLUG Magazine, wrote that "the premise is straightforward enough—an immortal, crackpot wizard went and turned the backside of a nearby mountain into a sadistic amusement park. Don't mistake the 'amusement' as necessarily intended as your own; Halaster Blackcloak, the aforementioned, arcane looney, has gone to great lengths in order to play with the playthings that wander his halls in search of wealth and fame. As such, DMs have a glut of monsters, traps and magical malefactions to inflict upon unsuspecting opportunists. [...] My main criticism with this book is the columns and columns of text that start