The Shadowdeep and the Underdark

Out of the Abyss

 After my last gaming group ceased I am now gathering a new band of adventurers and hoping to start a new campaign at our local boardgames cafe. This time rather than Descent into Avernus, I am going to run Out of the Abyss, another 5E hardback book for a campaign that should take the PCs from level 1 all the way up to high level (enough to take on demon lords at the end). This adventure combines two well-known aspects of D&D - the Underdark and demons. 

Out of the Abyss starts with the characters as prisoners of the drow, along with a motley crew of fellow prisoner NPCs with their own backgrounds and motives. The first half of the adventure is about escaping the drow and the underdark and making it back to the surface while realising that demon lords are being summoned to the underdark and wreaking havoc. A bit like Descent into Avernus, I get the impression that the book contains the framework and major plot points of the adventure, but as the DM I will probably be fleshing out a lot of the encounters and obstacles along the way. I might be posting some of my homebrew stuff for Out of the Abyss in a similar way to my Descent into Avernus posts: we'll see how things turn out. 

The Underdark 

Although man-made dungeons (or at least humanoid-made) have been part of D&D since its inception, and smaller natural caves and caverns likewise, the idea of the Underdark, a sprawling network of natural caves miles deep beneath the surface containing races and monsters that have never seen the light of the sun really started with D1: Descent into the Depths of the Earth, written by Gary Gygax and set in Greyhawk. That series of modules introduced the kuo-toa, the svirfneblin and drow (technically making their first appearance in G3: Hall of the Fire Giant King but really making their presence known in D1). The authors of the Forgotten Realms picked up that idea and ran with it, particularly R. A. Salvatore and his novels about Drizzt Do'Urden (I remember reading and enjoying the Dark Elf series, especially Homeland, which gives Salvatore's dark and gothic view of drow society in Menzoberranzen). Since then it has been a regular feature of D&D through the years. 

There have been numerous products that have looked at the underdark. Off the top of my head and from my own bookshelf, I would list

• 1st Edition AD&D D1: Descent into the Depths of the Earth
• 1st Edition AD&D D2: Shrine of the Kuo-Toa
• 1st Edition AD&D D3: Vault of the Drow
• 1st Edition AD&D The Dungeoneer's Survival Guide
• 2nd Edition AD&D The Night Below (boxed adventure)
• 2nd Edition AD&D Drizz't Do'Urden's Guide to the Underdark
• 2nd Edition AD&D Menzoberranzen boxed set
• 2nd Edition AD&D The Drow of the Underdark (FR sourcebook) 
• 3rd Edition D&D The Underdark (FR sourcebook)
• 3rd Edition D&D City of the Spider Queen

And of course there are plenty of fan projects and products

I may be speculating here, but I think it scratches a particular itch for exploration in a truly alien and dangerous environment. Real world caves are still a dangerous place to go if you are inexperienced and unprepared. And they do have ecosystems of sorts, from bats and bears near the surface to blind fish and albino insects much deeper. The ancient civilizations (Greeks, Meso-Americans and others) knew of these caves and thus began the idea of the mythic underworld, leading to the realm of Hades. It is no coincidence that many depictions of Hell from the real world place it deep underground. 

The D&D Underdark is a mythic underworld of sorts, albeit codified and statted out for game rules. In a way it is the ultimate megadungeon - no party can hope to clear it out or even explore it entirely. For the most part the PCs will be away from safety, supplies and other benefits of towns and cities. It requires an expeditionary mind-set with preparation, plenty of supplies and an awareness of the challenges. Light is almost entirely absent, navigation is very difficult, food is hard to find and sometimes even the air one breathes cannot be taken for granted. Combine that with the psychological effects of isolation, claustrophobia, the threat of underground hazards such as cave-ins and chasms and it becomes clear why the Underdark takes on a reputation of being one of the most hostile environments a D&D adventurer can enter. 

Mystara's Shadowdeep

Does Mystara have an underdark like Oerth or Toril? Yes, although it is generally refered to as the Shadowdeep. A while ago I posted Tilphon's Journal of the Shadowdeep, the account of an Alphatian explorer starting his journey in the Shadowdeep beneath Brun. It has not yet received a part 2, but I think that is more because I am not used to the in-world journal style that I had a go at with that post rather than the environment being explored - I nearly always write from a DM's point of view not that of a character.

Nonetheless, in my version of Mystara the Shadowdeep is there, albeit one of the least explored aspects. One of the things I have drawn upon is issue #14 of Threshold Magazine. Threshold is an amateur magazine put together by members of the Vaults of Pandius and its associated Mystara forum on The Piazza. 

Another important source has been the Gazetteer books, particularly Gaz13: The Shadow Elves. There are hints of underground realms in Gaz2: Emirates of Ylaruam, Gaz7: The Northern Reaches, Gaz4: The Dwarves of Rockhome  and quite a lot in Gaz10: Orcs of Thar. Nonetheless, the Shadowdeep is a lot less developed than Faerun’s Underdark, probably because Mystara and B/X D&D has a vastly smaller audience than the Forgotten Realms and whatever the current edition of D&D is. The bad news is that this means more work for DMs wanting to run Shadowdeep adventures and campaigns. Good news is that the DM has a much more free hand in what they want to put there. And of course just because something in the gazetteers is canon, it doesn’t mean the DM has to stick to it in their campaign. If they want to replace shadow elves with drow or have drow as rivals to the shadow elves, that’s really up to them.

Having said that, I feel it is a good thing to keep the Shadowdeep distinct from the Underdark. I do not intend to bring drow, mindflayers, duergar, svirfneblin and the like to Mystara in this blog - the Shadowdeep is its own thing. To be honest I have mentioned kuo-toa in a post involving fish-folk. Although amusing at the time, I am not sure if it was sensible in the long run. A long time ago I did  a similar post about my homebrew world of Kaelaross and its possible underdark, but I really didn’t come up with anything concrete or playable. And it is a big topic (and geographical volume) to explore and develop. 

My current view is that it is something I can work on in various blog posts. I have a tendency to flit between realms and topics on this blog - Karameikos one week, Norwold another, then new spells, then a homebrew mini-adventure. So I’m not going to make a grand commitment to produce a new quasi-gazetteer, but I’m leaving the Shadowdeep open for me to visit in later blog posts.