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Deep Carbon Observatory
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Deep Carbon Observatory

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Deep Carbon Observatory is an adventure for Dungeons and Dragons.

The adventure takes players from a town devastated by an unexpected flood, through a drowned land where nature is turned upside down and desperate families cling to the roofs of their ruined homes, hiding from the monstrous products of a disordered world, through the strange tomb of an ancient race, to a profundal zone, hidden for millennia and now exposed, and finally to the Observatory itself, an eerie abandoned treasure palace, where they will encounter a pale and unexpected terror which will seek to claim their lives.

The adventure is suitable for a lucky mid-range party, a stupid high-level party or an exceedingly clever low level party. It is difficult, with a meaningful possibility of character death. Should you find them, and defeat their guardians, the treasures of an ancient culture will be yours.

At the final point of the Observatory is a glimpse of another world.

Deep Carbon Observatory is about 90 pages long, 20,000 words with four maps and extensive artwork by Scrap Princess.

Stats are minimal and given for LOTFP but should be easily transferable into any simple D&D system.

It was created by Patrick Stuart  and Scrap Princess. The layout was by Alex Mayo and it was brought into being at the command of Zzarchov Kowalski


If you prefer top-down maps, Gus L has created some for this adventure for free and Luka Rejec edited them into a more pleasurable form. go here to access them.


Robin Zink at RENFIELDS CAT has actually run it.

"I love this thing. It has introduced myself and a rotating circle of about ten friends to Old School role-playing and we are having the best fucking time."

Basicred RPG

"The phrase "There's a flood and your PCs are compelled to investigate!" is not in the module because it got in the way of poison and rules for the stairs, and because doing awesome things is taken as granted in your players."

"Like many contemporary adventures it’s shock full of desperation and sadness and malice. What makes it stand out, however, is the human scope."

Dungeon of Signs

"Ultimately Deep Carbon Observatory is a thought provoking and wonderful adventure, almost novelistic in its scope and strangeness." ... "Despite my affection for the creator of Deep Carbon Observatory it has troubles. "

Save vs Totalpartykill

"Scrap Princess’ illustrations contribute to the overall tone of the book. I find her work is so frenzied and terrifying. Maybe that’s not the right word, but there is something about how she draws that I find really visceral. I don’t know anyone else that draws like her."

Hack and Slash

The nearest I can figure is avant garde is code for everything in this module is interesting and novel.

Cauldrons and Clerics

Seriously, my points here are - it gives you pretty much everything you need for 4-8 sessions of gaming, depending on your style (my style of games would probably end up at the higher end of that amount) - which for $10 is a steal. (In the same review Luka also goes into some of the negatives.)


This adventure deserves to be spoken about in hushed tones and discrete symbols.

Violent Media

Go buy this fucking thing… It’s incredibly good and very, very interesting.

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Reviews (9)
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February 11th, 2017
This is a review based on running DCO. DCO turns the modern adventure design paradigm on it's head- where telling rather than showing is the norm, and word count and bloat buries what the "core idea" or concept so deep that the running adven [...]
November 20th, 2016
Deep Carbon Observatory is very rich on atmosphere. So much so that "the dungeon" of the adventure only sets up a slight portion of the adventure. Combat definitely takes a back seat in this adventure, but this isn't to say that it is non-e [...]
September 4th, 2016
I really like the morally tough decisions the party has to make. It also contains a lot of little really clever weird elements. The only negative pint are the maps, which are atmosspheric, but not user friendly. [...]
March 6th, 2016
I loved this. Its totally dark full of Weirdness and a little scary. It will be a little bit of a challenge to DM, but I am excited to try. It's pretty harsh though, so fair warning. I will be toning down the opposition a little or it will [...]
August 29th, 2015
In the typical LotFP fashion, the "winning" scenario is damn near impossible, the adventure contains numerous devices which screw player characters royally, and is grimdark to a fault, replacing wit and imagination with tragedy and cruel joke [...]
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Gold seller
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19.25 MB
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File Last Updated:
July 20, 2014
This title was added to our catalog on June 30, 2014.