Advanced Search

The Obsidian KeepClick to magnify
Quick Preview
Full‑size Preview

The Obsidian Keep


Last month, a fleet of holy warships sailed out to destroy the evil sorcerers of the Obsidian Keep.

The fleet never returned.

Today there is a call for righteous heroes (or brave treasure hunters) to find the fleet, rescue the sailors, recover lost treasures, and discover the fate of the cruel masters of the Obsidian Keep!

ADVENTURE TYPE: Exploration / Mystery / Dungeon Delve / Low Level


Read the narrative of one early play test of this adventure:



"The formatting here is SO good that it it appears simple. Actionable situations. Lots and lots of things to talk to. Clues to other areas. Interesting situations. The writing is clean, terse, and evocative. It’s immediately obvious, from every aspect, that this is a good adventure." --Bryce Lynch (


This adventure is intended for low-level characters (1-3). It is primarily geared for exploration, social encounters, and general mystery-solving. Opportunities for combat lurk everywhere.

It runs 8 to 16 hours.

Players will explore the harbor full of wrecked ships, the beach shanty-town of refugees, the ruined castle grounds, and the Obsidian Keep itself.

There are numerous NPCs as well as unique magical items and other treasures.

NOTE: This adventure was written first for 5e and then converted into an OSR version. In the OSR version, you will find (a very few) 5e-isms and artifacts.  

INCLUDES: DM notes, room descriptions, NPC notes, dialogue prompts, stat blocks, original creatures and treasures, and maps.

KEYWORDS: ship, shipwreck, sailor, skeleton, shark, crab, relic, artifact, angelfire, harbor, beach, mystery, lore, grave, rescue, castle, ruin, mutant, horror, mutation, cult, cultist, aberration, negotiation


The dying world of Harth extends beyond RPGs to a new series of novels:
 Customers Who Bought this Title also Purchased
Reviews (2)
Discussions (3)
Customer avatar
Gerri M May 03, 2021 3:25 am UTC
Just finished running this and my players loved it! It was really easy to run and the story held together beautifully.
Customer avatar
prashant P July 10, 2020 3:22 pm UTC
When do we see a Dungeon Age Setting? :) Love most of your products, very concise and easy to run at the table, with the same amount of content as 60 plus page monstrosities.
Customer avatar
Joseph L July 10, 2020 5:36 pm UTC
Thanks so much! I'm currently working on a campaign-length adventure, but that won't be complete for a while. What would you like to see from a Dungeon Age setting book?
Customer avatar
prashant P July 19, 2020 6:52 pm UTC
I think similar to what you do really well, keep it focused on the play at the table to linking to relevant background where needed, and all the fun and unique stuff you add in. An Active Campaign Setting would be great!
Customer avatar
Joseph L June 20, 2020 2:47 pm UTC
Review by Bryce Lynch:
Browse Categories
$ to $
 Follow Your Favorites!
NotificationsSign in to get custom notifications of new products!
 Recent History

Product Information
Gold seller
File Size:
3.9 MB
Original electronic Click for more information
Scanned image
These products were created by scanning an original printed edition. Most older books are in scanned image format because original digital layout files never existed or were no longer available from the publisher.

For PDF download editions, each page has been run through Optical Character Recognition (OCR) software to attempt to decipher the printed text. The result of this OCR process is placed invisibly behind the picture of each scanned page, to allow for text searching. However, any text in a given book set on a graphical background or in handwritten fonts would most likely not be picked up by the OCR software, and is therefore not searchable. Also, a few larger books may be resampled to fit into the system, and may not have this searchable text background.

For printed books, we have performed high-resolution scans of an original hardcopy of the book. We essentially digitally re-master the book. Unfortunately, the resulting quality of these books is not as high. It's the problem of making a copy of a copy. The text is fine for reading, but illustration work starts to run dark, pixellating and/or losing shades of grey. Moiré patterns may develop in photos. We mark clearly which print titles come from scanned image books so that you can make an informed purchase decision about the quality of what you will receive.
Original electronic format
These ebooks were created from the original electronic layout files, and therefore are fully text searchable. Also, their file size tends to be smaller than scanned image books. Most newer books are in the original electronic format. Both download and print editions of such books should be high quality.
File Last Updated:
September 10, 2023
This title was added to our catalog on June 07, 2020.
Dungeon Age Adventures
Publisher Average Rating