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Undermountain: The Caverns of the Many-Legged
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Undermountain: The Caverns of the Many-Legged


"Cavern of the Many-Legged is very well written and thought out. I especially like the Keril NPC and the Talash NPC, as well as the intricate political intrigue between the various factions and how they connect with the outside world of the dungeon of the mad mage. Definitely worth a pick-up, especially if you want a supplement to the mad mage." - Cra S.

"The amazing variety presented in this module allows the players to fight some of the most interesting underdark monsters, and allows them the choice and agency upon which Dungeons and Dragons is built." - Realwarp Media review by Ryan Langr (

Undermountain: The Caverns of the Many-Legged is an adventure detailing a hidden mini-level for Dungeon of the Mad Mage for characters of levels 12-13. It uses some of the story and lore of that book, but it can be incorporated or dropped into any setting or homebrew campaign.

In a hidden part of Undermountain, former slaves feed their monstrous queen who is fixated on revenge. A broken drow house has finally found a place to call home – only to become abominations. And a massive beast slithers, hunting for anything to satiate its hunger and quell its madness. Welcome to the Caverns of the Many-Legged. Which side, if any, will adventurers choose as they explore this hidden mini-level for Dungeon of the Mad Mage?

In this adventure, you will find:

  • a mini-level that can be easily incorporated into Dungeon of the Mad Mage
  • a vivid cast of unique monsters and NPCs, including chitine warriors, a choldrith queen, a spellcasting draegloth, a mad yuan-ti anathema, and others (stat blocks provided for all creatures not in the Monster Manual)
  • locations that could be used or adapted elsewhere, such as a chitine colony and a drider-controlled drow fortress
  • a combination of roleplay, exploration, and combat encounters

About the author

David McDonough (@DS_McDonough) is a professional editor, writer, think tanker, and recovering academic in Ottawa, Canada.  

Change Log:

Dec. 11 - Fixed a few typos and improved the text wrapping around some of the images.

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Michael B July 01, 2019 8:18 pm UTC
Would you be able to include the maps as a separate set of images for VTT use?
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File Last Updated:
January 15, 2019
This title was added to our catalog on December 07, 2018.