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Ominous Crypt of the Blood Moss
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Ominous Crypt of the Blood Moss

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A mad mage | A defiled crypt | A cosmic fungal entity

They say Ursodiol the Mad was the greatest mind to have ever breached the great Cosmic Void; that he looked beyond the myriad stars and the blackest depths of the hells into the swirling magical protoplasmic morass that is the beginning and end of everything. When they found his corpse, so hideously changed was it that it drove those who saw it to madness and despair. Fearful, they entombed him in the crypt of his forbears and sealed it tight. But little did they know that Ursodiol brought back something with him from his cosmic journey. And it is hungry...

Ominous Crypt of the Blood Moss is an old-school style adventure primarily designed for use with Old-School Essentials and other iterations of the Basic/Expert rules for the original fantasy roleplaying game.

A dungeon crawling adventure of cosmic horror for characters of 2nd to 4th level!

"Ominous Crypt of the Blood Moss is a great little adventure. It uses a familiar, enjoyable recipe with a twist on a few of the ingredients, while it is crafted with love and attention." - Antonios S,

"There’s a LOT to look at and poke at and clean and examine in each room. That’s good." - Rated "The Best" by Bryce Lynce,

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Reviews (1)
Discussions (4)
Customer avatar
David W July 19, 2021 6:48 am UTC
Are you in medicine? Why Ursodiol otherwise?
Customer avatar
Frederick F July 21, 2021 8:02 am UTC
Good question! My cat is currently ill with liver failure and was diagnosed around the time I wrote the adventure. It’s one of the medicines that she’s currently on.

Inspiration comes from odd sources…
Customer avatar
David W July 21, 2021 6:30 pm UTC
Originally extracted from bear gallbladders… Hope kitty is doing better.
Customer avatar
Frederick F January 20, 2021 10:57 am UTC
Updated versions of the PDF files are now available - these include corrections to typos in the text. I've also added GM and player-facing maps in a .zip file.

Print files have also been updated, which will lead to print copies being unavailable until the new files are received via the printer - I may need to obtain new proofs before they go live, so please bear with me while these become available.

All the best,

Onieromantic Press
Customer avatar
Toby V January 09, 2021 5:05 am UTC
The following review mentioned many typos, have these been corrected?
Customer avatar
Frederick F January 14, 2021 9:08 pm UTC
Hi Toby,

I think there are about five or so typos. Correcting these is on my to-do list! I will hopefully get them corrected soon. I am also planning on adding separate maps to the PDF download as well - everyone who has already purchased should get the updated files.


Customer avatar
Niclas M July 22, 2020 2:37 pm UTC
What is the difference between the two files in the download?
Customer avatar
Frederick F July 23, 2020 5:36 am UTC
The only difference is one is formatted to be spreads, the other as single pages. The content in both is otherwise the same!
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Silver seller
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File Size:
44.33 MB
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File Last Updated:
January 20, 2021
This title was added to our catalog on July 17, 2020.