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Mirt's Undermountain Survival Guide
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Mirt's Undermountain Survival Guide



It takes more than a strong arm and a sharp sword to overcome the dangers of Undermountain. What you need is an expert, someone who has been there before and can advise what resources you will need to survive. Who better to guide you than Mirt, the renowned veteran of Undermountain?

Mirt's Undermountain Survival Guide provides everything you need to make your expedition a resounding success, including:

  • Five new races: the Giff, Half-ogre, Illithid, Nimblewright, and Sprite.
  • Five new archetypes: the Cavern Domain, Circle of Stone, Wayfarer, Trapsmith, and the Dark Pact.
  • A new class: the Factotum.
  • Twenty-five new spells.
  • Fifty new magic items.
  • New dungeoneering rules.
  • New underground hazards.
  • Porters, guides, and other hirelings.
  • And... Mirt's Dungeon Delving Tips!

Mirt's Undermountain Survival Guide is brought to you by these Guild Adepts: M.T. Black, Greg Marks, James Introcaso, Will Doyle, and with Chris Lindsay supplying the voice of Mirt!

This product is a DMs Guild Adepts adventure supplement! The Dungeon Masters Guild Adept program brings highly talented individuals together for creative development. Guild Adept products are identified with the golden ampersand and logo.

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Reviews (5)
Discussions (4)
Customer avatar
Mark M August 19, 2019 2:52 pm UTC
How do Sprite-sized weapons work with Heavy weapons, like the Longbow and the Greatsword? Is a "Sprite-sized" Greatsword still appropriate for Great Weapon Master? Is it at Disadvantage because of the size issue? Would a Small-sized creature be able to wield a Sprite-sized Greatsword not at disadvantage?
Customer avatar
M.T. B August 19, 2019 9:03 pm UTC
Those are good questions and I haven't thought about them. I feel like they would have disadvantage, but what are your thoughts?
Customer avatar
Corey S April 02, 2019 2:06 pm UTC
I also would buy if it were an FG module...
Customer avatar
Mitchell B March 31, 2019 7:25 pm UTC
Is there a FG .mod file that comes with purchase? If so, I plan to immediately buy it.
Customer avatar
M.T. B March 31, 2019 9:40 pm UTC
No, not at this stage.
Customer avatar
Mitchell B March 31, 2019 11:13 pm UTC
Any plans to convert it into the near future?
Customer avatar
M.T. B April 01, 2019 1:05 am UTC
If more people show interest, I might add it as a reward level. If it hits platinum, for example, I commission an FG conversion.
Customer avatar
Nicholas C March 22, 2019 11:12 pm UTC
So one of my players was looking over the nimblewright and specifically the repairable component. It allows mending to be cast instead of spare the dying, however mending has a casting time of 1 minute meaning the players would have gone through all their death saves and then some. Seems like a fairly useless component at this point, might need some tweaking?
Customer avatar
M.T. B March 23, 2019 3:50 am UTC
You are correct - our mistake. Just use "spare the dying" as usual. I will correct the pdf when I get a few more errata.
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File Last Updated:
March 08, 2019
This title was added to our catalog on March 08, 2019.