Attention - We've moved!

Click the link to the right to go to the new help center: New Help Center

This version of the help center is no longer being maintained and will be deactivated on June 30th, 2023

Chaosium - Miskatonic Repository

Jeffrey Montgomery -





Welcome to the Miskatonic Repository! We’re excited to read the bounty of horror you’re about to share with us. Reading these guidelines will prepare you for making, preparing, and publishing your Miskatonic Repository content.

What is it?

The Miskatonic Repository is a way to publish and distribute Call of Cthulhu content you have written, including original scenarios, settings, spells and more.

You create content, format it to our design template, and then upload the PDF to the site. Your work becomes part of the Miskatonic Repository content on DriveThruRPG – able to be accessed by the community and, optionally, providing a financial return to you. 

Chaosium has created easy to use style templates (in both MS Word and Adobe InDesign) and free Art Packs specifically created for the Miskatonic Repository to help you create your own content.

Can I sell the content I create?

Yes, creators can make money from their published community content – or make it freely available (it is entirely up to you). Any retail sales are split between the creator (i.e. you), OneBookShelf (DriveThru's parent company), and Chaosium. As creator, you get 50% of the sale. For example, if your product retails on the site for USD $10.00, this is how the split of revenue is made:

elderbullet.png  $5.00 to the creator

elderbullet.png  $3.00 to DTRPG 

elderbullet.png  $2.00 to Chaosium

You set the price. Which could be free or otherwise. The financial process is fully automated, requiring no additional administration from the creator. You can read DriveThru’s notes about this at: 

Note: you may be familiar with the existing community content for D&D, ours follows the same model in terms of revenue split and general rules.

What rules can I use in my product for Call of Cthulhu: Miskatonic Repository?

Your work can use any rules and setting materials from the following 7th Edition books and materials published by Chaosium

elderbullet.png  Call of Cthulhu Keeper Rulebook

elderbullet.png  Call of Cthulhu Investigator Handbook

elderbullet.png  Keeper Screen Pack

elderbullet.png  Pulp Cthulhu

What can’t I use in my Miskatonic Repository product?

Rules from Call of Cthulhu 1st-6th editions, or any material that infringes on copyright held by someone else.

How can I use Miskatonic Repository art?

The Miskatonic Repository art is licensed for use in content submitted to our community content program. That’s it. What you write for the program is the only place you can use those materials, and you must properly attribute the artists of any program art materials you use. Stock art and templates from Chaosium will be available for your use via OneBookShelf. Any other art from official Call of Cthulhu material cannot be used for the Miskatonic Repository products, but you can commission art for use in your product. Responsibility for sourcing art that is available for commercial use is that of Repository product creators.

Five free Miskatonic Repository Art Packs are available: 1920s Rogues’ Gallery, Curious Things, Ill
Omens, Mythos Monster Silhouettes and Weapons and Relics.”

What kind of products are welcome in the Miskatonic Repository?

Original scenarios, settings, spells, stats for monsters and background dossiers (be they on cults, conspiracies, occult societies, or other groups of interest to Investigators).

You may also create your own version of handouts for official 7th Edition Call of Cthulhu campaigns (but remember that handouts for Chaosium scenarios bear our copyrighted text, so ensure you properly credit Chaosium: see the notes on credits and copyright below).

Products in the Miskatonic Repository may be in English or any other language. 

If a current, in-print Call of Cthulhu translation exists (e.g. Japanese, Korean, German, French etc) creators must use the current edition of the game in that language. For example, Japanese contributions to the Miskatonic Repository must use the current Japanese edition of the rules.
For languages where a current, in-print edition does not exist, creators must use the English Call of Cthulhu 7th Edition rules as their reference.

What types of content are prohibited?

elderbullet.png  Conversions of content from other roleplaying games or other copyrighted media into 7th edition rules.

elderbullet.png  Anything written for the 1st-6th editions of Call of Cthulhu.

elderbullet.png  Comics, fiction (unless short vignettes in roleplaying game materials)

elderbullet.png  Software or apps.

elderbullet.png  Products that infringe on the intellectual property of others.

elderbullet.png  Crowd-funded content.

elderbullet.png Material included in Chaosium products under license.Licensed material not available for community use includes, but is not limited to, the Mythos creations of Ramsey Campbell, the Mythos creations of Brian Lumley, and Mythos fiction released by Chaosium under license. Please check the copyright statements in your Chaosium products to determine ownership and copyright. 

In addition

elderbullet.png  Your Work does not contain material that a reasonable person would consider libelous, defamatory, racist, homophobic, or discriminatory; that violates the copyrights or trademarks of another party; or that violates the law.

elderbullet.png  Your Work does not contain material that the general public would classify as extreme adult content, such as pornography or extreme violence.

AI Art

We are concerned about the ethics of AI art and its impact on the livelihoods of artists, and the ability of artists to maintain control over use of their creations. Effective 31 March 2023, AI Art (e.g. Midjourney, Dall-E) is not permitted in new Chaosium community content titles, including the Miskatonic Repository.

Can I create and sell content for previous editions of Call of Cthulhu?

We will only accept content designed for 7nd Edition. If you have something for a previous edition that you want to use with a product, you must update it to 7th edition to do so. This does not cover updating entire scenarios published in earlier editions – we advise you to email us about such things as a pitch: However, a sequel (or even a prequel) would be possible, provided it has more original content than content referenced from a previous editions’ scenario.

Can I copy information from 7th edition rulebooks into my product?

You can reference information in the 7th edition products, but please refrain from copying directly from the books whenever possible - an exception to this is monster statistics taken from Chaosium’s Call of Cthulhu 7th Edition products, which you may reproduce in material for the Miskatonic Repository.

Who owns material in the Miskatonic Repository?

You retain the copyright of any original IP you create for the Miskatonic Repository. Chaosium owns the IP it provides for use including rules, settings, characters, concepts, plots, storylines etc.

How does credits and copyright work?

Our template features the trademark and licensing language you must include on the Credits Page of your work. This acknowledges Call of Cthulhu is a trademark of Chaosium Inc. and is used with permission.

You should also include a copyright notice of your own – [title of work] [©date] [name of authors]

If you use any art from one of our Art Packs, simply follow the crediting guidelines from that pack.

If you intend to use art from elsewhere, ensure that you have clear permission to do so and credit the artist or source.

I already have a Chaosium license, how does this affect that?

The Miskatonic Repository is a separate element from our licensing structure and does not supersede your existing license – it essentially works separately in parallel, if you choose to contribute to the program.

How do I prepare the PDF of my title for sale?

There’s a few steps here to walk you through if you’re a creator using DriveThruRPG for the first time. There’s also an additional step for you as a community content creator. After creating your content, go to your account page and look in the "My Content" section. You can use the "Add a new title" link after you agree to the Community Content Agreement.

CREATE - Lay out your Digital PDF from scratch...

QUICK SPECS (PDF) - To get you started.

QUICK CHECKLIST (PDF) - To be sure you don't miss anything.

Microsoft Word Tutorial and templates

Download MS Word Tutorial - Advice on how to use Microsoft Word, and a few other programs to prepare a DIGITAL ONLY title. POD titles can not be created in Word
Download MS Word Templates - A ZIP file containing Word (94) templates for 6" x 9", 6.14" X 9.21", 6.25" X 10.25", 7" x 10", 8.5" x 11", and 8.25" x 11" products.

InDesign Tutorial and templates

Download InDesign Tutorial - This tutorial will offer you some advice on how to use Adobe InDesign to prepare an optimized digital edition PDF book.
Download InDesign Templates - A ZIP file containing CS4 InDesign templates for6" x 9", 6.14" X 9.21", 6.25" X 10.25", 7" x 10", 8.5" x 11", and 8.25" x 11" products.

Scribus Tutorial and templates

Download Scribus Tutorial - This tutorial will offer you some advice on how to use Scribus to prepare an optimized digital edition PDF book. Scribus is a free layout program available at
Download Scribus Templates - A ZIP file containing Scribus templates for 6" x 9", 6.14" x 9.21", 6.625" x 10.25", 7" x 10", 8.5" x 11", and 8.25" x 11" products

EPUB & MOBI Tutorial and templates

EPUB & MOBI EXPORT TUTORIAL - FROM INDESIGN (PDF) - To show you how to prepare your InDesign file for export to the ePub format, and how to use Calibre to convert your ePub file to the Mobi format.

EPUB & MOBI EXPORT TUTORIAL - FROM MICROSOFT WORD (PDF) - To show you how to prepare your Microsoft Word file for export to the ePub format, and how to use Calibre to convert your ePub file to the Mobi format.

PREPARE - You've already created a PDF and want to see if it's upload ready. Our PDF's for Digital Titles are best when a few guidelines are followed. Check the links below to get your files ready!

READY - Once your print files are ready to upload...

  • UPLOAD - Will show you where and how to upload your files for digital download

Do not security-lock your Digital PDF. For our watermarking security process to work, the PDF files must be unlocked (so they can still be edited). We add the watermark at checkout and then lock the file ourselves.

Once content is published, it can be found in the Miskatonic Repository. 

After your product is for sale, your account will begin to accrue a 50% royalty every time your title sells. You can withdraw your accumulated royalties via PayPal by going to the My Money section of the Account page. Note that the My Money section of your Account page will not display until you have a balance accrued.


Have more questions? Submit a request


Please sign in to leave a comment.