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The Corwyn Catacombs


Delve into ancient ruins of civilizations past in this one-session adventure for 4th level heroes of the world’s greatest roleplaying game!

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Also available alongside Green Lineages as a Fantasy Grounds module on Steam or the Fantasy Grounds store, and on Roll20!

Delve into ancient ruins of civilizations past in this one-session adventure for 4th level heroes of the world’s greatest roleplaying game!

The Corwyn Catacombs is a one-session adventure that sees characters delve into ancient ruins of a precursor civilization to rescue citizens of Corwyn and keep the village safe from harm! Will the heroes succeed in vanquishing the evils that lurk within? Or will they meet a grisly end, to rise again as servants of the undying Chiran Empire?

Now fully revised and featuring:

  • Original art by Izzy Collins, including a new cover piece!
  • A new campaign setting, complete with all the information you need to site characters within the continent of Tyllia, and plot hooks to continue your adventures in the world!
  • 5 premade characters – the adventuring company Calarin’s End are included so that you can play with next to no setup!
  • New monster statblocks — do battle with the Bone Knife Goblins and their bugbear leader Sklaar, as well as necromantic chiran servitors and a preserved chiran themselves!
  • The debut of the Animancer Paragon Monster system – the chiran is a ‘paragon monster’ using our new system for legendary monsters, featuring optimisations for use as a solo monster and exciting features to give narrative structure to a battle with them!
  • The Arcus Stone of Preservation — a fresh take on an established magic item!
  • And a number of revisions, expansions, and enhancements to the original text!

Praise for The Corwyn Catacombs

“Experts ought to buy it, just to rip off the format” — High Level Games

“This is a fantastic one shot with intrigue, adventure and a bloody brilliant blend of fantasy and eldritch sci-fi horror in the dark depths of the Corwyn Catacombs. Perfect for a quick, fun game, but the ideas and elements are full of seeds and insidious roots that make this perfect as a campaign starter.” — Sebrina Calkins

“Great little oneshot: an adventure that adds a new twist on some classic tropes, with equal opportunities for combat, exploration, and roleplay. Big bonus points for a product that has beautiful layout, design and interior art – it really presents itself professionally. Add in some cool new monsters, a neat magic item, and a village with well-crafted NPCs, and you’ve got a product that you can bring directly to the table with limited DM prep.” — Tavern Tales

Layout deserves special mention: The NPC-depiction, the bullet pointed rooms – they really help render the module easy to use, and look professional and well-crafted – kudos!” — Endzeitgeist

The Corwyn Catacombs is set in the continent of Tyllia, but is neutral and self-contained enough that Game Masters can use the adventure in any campaign setting they’d like with minimal effort. A selection of the Tyllian pantheon, as well as background information on the setting and different species’ place in it, is provided, such that characters can be made to fit easily into the world as presented.


Izzy Collins


Jake Bhattacharyya



Rule System

Fifth Edition


Q. Where do I find the other 14 Arcus Stones?

Right now? Nowhere. Other Arcus Stones might appear in future products (we’ll update it here if they do), but at present the Arcus Stone shown here is intended as a jumping-off point for your own ideas. What powers do you think the others might grant? Where might they be found? Who else might be after them?

Q. What virtual tabletops is the adventure available for?

Corwyn is available for Roll20, Foundry VTT, and Fantasy Grounds (also on Steam). It’s also available bundled with Green Lineages for Fantasy Grounds (Steam page here)!

Changelog & Errata

If you notice a typo or error, email us using our contact form and we’ll ensure it’s fixed. If you have feedback on the adventure itself and would like to help contribute towards future revisions, we also have a feedback form for the adventure here. Thanks!


  • There is no errata at this time. The latest version available for download has all current revisions!


  • Redesignated the chiran as a ‘Paragon Monster’ in line with how we’re naming the framework going forward, and updated the statblock to match. Hopefully less confusion with the core legendary monster framework now.
  • Fixed an error with both the preserved chiran and the chiran servitor‘s proficiency bonus, with each being listed as one higher as they should be.
  • Added a footnote explaining that no other Arcus Stones have been published (yet!), and advising those interested in them to use the Preservation stone as a framework for their own ideas. Hinted at the possible existence of an Arcus Stone of Frogs.
  • Fixed some issues with Cedric and Istrea’s sheet. Cedric didn’t have a shield he was meant to, and Istrea was listed as both an Accidental and Unintentional Spire Dropout.
  • Fixed some minor grammatical and layout errors


  • Updated back cover to more closely match the front cover background.


  • Revised monster statblocks for the Preserved Chiran and Chiran Servitor
  • Made the Preserved Chiran a legendary monster in line with our legendary monster system
  • Added three new statblocks – the Bone Knife Goblin, Sklaar the bugbear leader, and the Bound Soul the chiran can summon.
  • Added five new premade characters – Banir, Cedric, Drayax, Istrea and Tira. Supplied them with a print friendly and form-fillable copy of their character sheets.
  • New map, supplied in 4 combinations of gridded/ungridded and labelled/unlabelled.
  • Expanded the Aetherrail station with the inclusion of Fives the guard.
  • Revised the setup with Hector and the goblins and their relation to one another.
  • Redid the entire layout with a new font and colour scheme.
  • New cover art
  • Numerous other miscellaneous text revisions


  • Change of logo and branded links to reflect our new name.


  • Tweaked some language around the Chiran.
  • Added a text-less version of the dungeon map.
  • Tweaked Gront’s diary page
  • Fixed the map placement in Appendix C that was causing bleed over to Appendix D


  • Fixed an issue in layout resulting in the Preserved Chiran and Chiran Servitor using the same stat array. The Preserved Chiran’s stats will now make sense.
  • The Preserved Chiran’s skills have also been corrected.
  • The Preserved Chiran’s hit points have been moved in line with other medium monsters.
  • Other minor text tweaks to monster statblocks.
  • Minor tweaks to the Goblin Common Space and Bone Knife Pack Encounter to clear up confusion about the number of goblins present.
  • References to the orbs needed to open the Preserved Chiran’s door are now bolded regularly for clarity.
  • Added a scale to the Catacombs Map.
  • Added a Persuasion clause to the initial encounter with the goblins and cleared up some rules ambiguity.
  • Gront’s diary entry is now available as a full size handout.


  • Layout tweaks
  • Added changelog link to the credits page.
  • Arted up Gront’s diary entry a little. Now dirtier than ever!


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