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

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UNDERMOUNTAIN BECKONS... TERROR AND TREASURE AWAIT!

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 (7)
Customer avatar
Igams G January 21, 2020 3:19 pm UTC
Hello, I've been wondering how does the Veil of Shadow spell function? We're using this in my group and having trouble with the wording.

"... In addition, if you do not move or take actions in an area of dim light or darkness, you become invisible."

When does the trigger for invisibility occur? Do you need to NOT move/attack in dim light/darkness for an entire turn to activate it? Or is it meant to activate immediately if you end a turn in dim light?
Customer avatar
M.T. B January 22, 2020 5:33 am UTC
CREATOR
Good question - I need better wording. Something like, "If you start your turn in dim light or darkness, if you do not move or take an action, you are invisible"
Customer avatar
Igams G January 26, 2020 8:30 am UTC
Thanks for the reply!
Customer avatar
Cedric A November 28, 2019 6:21 pm UTC
PURCHASER
I have a question regarding the Factotum's Arcane Dilettante ability. It says, "by spending one 1 ingenuity point, you are able to cast one of the spells you know." Do they still need to expend a spell slot to cast the spell, or just the ingenuity point?
Customer avatar
Cedric A December 02, 2019 7:50 am UTC
PURCHASER
A few more questions regarding the Factotum:

1) It doesn't have Arcane Focus proficiency in the spellcasting section. I'm assuming it's supposed to, since an Arcane Focus is one of the choices in the starting equipment section.
2) In terms of multi-classing and spell slots, is the Lore of the Theurge considered a 1/3rd caster (like Eldritch Knights and Arcane Tricksters)? What about the base class?
Customer avatar
M.T. B December 02, 2019 7:57 am UTC
CREATOR
Thanks Cedric, I've let Greg know about these questions
Customer avatar
Cedric A December 05, 2019 5:37 am UTC
PURCHASER
Also, the base class costs 1 ingenuity point to cast a cantrip? I understand that was the case back in 3.5, but cantrips back then were a limited resource and in 5e, cantrips are sort of standardized attacks for casters. It feels strange.
Customer avatar
Cedric A December 09, 2019 10:38 pm UTC
PURCHASER
Aaand another question...

The Spell Slots gained for the Arcane Dilettante base class feature. Do they recover on a short rest or long rest? Right now it doesn't say either way (unlike the Lore of the Theurge, which specifically says long rest). I was wondering if the base class basically got a weak version of the warlock's pact magic.
Customer avatar
Cedric A December 10, 2019 9:05 pm UTC
PURCHASER
Got my questions answered by Greg.

1) It does not have the Spell Focus proficiency, so it doesn't use an Arcane Focus.
2) The Multi-classing for spell slots is treated as a 1/4th caster only if you have Lore of the Theurge, otherwise it doesn't add to other spellcasting classes. The Arcane Dilettante spells are treated as a separate thing.
3) The Arcane Dilettante cantrip costs an ingenuity point per use. The cantrips from Lore of the Theurge do not.
4) Arcane Dilettante spell slots must be used along with the ingenuity point.
5) Arcane Dilettante spell slots recover on a long rest.
Customer avatar
Philip K November 21, 2019 4:24 pm UTC
PURCHASER
Any plans to do print on demand softcover release?

I feel like this supplement deserves a place on my shelf next to Xanathar’s Lost Notes to Everything Else and the Art of War for D&D Players...

Second question: how would Ranger: Wayfarer’s Danger sense interact with the UA Blind Fighter fighting Style and how would the subclass interact with the new Variant Ranger at large?
Customer avatar
M.T. B November 22, 2019 11:51 pm UTC
CREATOR
At this stage, OBS are not turning older titles in POD products. If this policy changes, we will have a look at this.

I'll have to pass your second question about the Wayfarer onto Greg, as he wrote that archetype!
Customer avatar
Gregory M November 23, 2019 12:06 am UTC
PURCHASER
For "how would Ranger: Wayfarer’s Danger sense interact with the UA Blind Fighter fighting Style," I don't think Blind-fight lets you see the trap/spell/ambush coming, so while you might not have disadvantage, I don't think Danger Sense would kick you to advantage. The class feature wasn't really designed with this Unearthed Arcana fighting style being considered, so if your DM wanted it to work, it would probably be okay.

For "how would the subclass interact with the new Variant Ranger at large?" You could probably sub it in like the archtypes they give in the new variant ranger rules, but note that the version in Mirt's wasn't designed with these new rules either, so its missing a 5th-level feature and you and your DM would need to work on something to fit in there.
Customer avatar
Philip K November 28, 2019 1:16 am UTC
PURCHASER
Thank you both for your answers!

I understood that DM's Guild Adept titles were of a bit of different category than any old DM's Guild titles, so I thought there was more of a channce for a revisit. Who is OBS though?
Customer avatar
M.T. B November 28, 2019 4:02 am UTC
CREATOR
OneBookShelf run the DMs Guild and DriveThruRPG
Customer avatar
Mark M August 19, 2019 2:52 pm UTC
PURCHASER
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
CREATOR
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
Mark M September 03, 2019 2:28 pm UTC
PURCHASER
I don't know. These are questions that rely on having a robust set of weapon-sizing rules, like 3e did. 5e doesn't. So I'm not sure it makes a lot of sense to have a class that isn't Small or Medium. The rules just aren't there to support it.
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
CREATOR
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
CREATOR
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
PURCHASER
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
CREATOR
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.