Sandy Petersen's Cthulhu Mythos for Pathfinder

Created by Sandy Petersen

The definitive guide by Sandy Petersen. New rules and over 100 monsters for the Cthulhu Mythos plus tons of 28mm scale miniatures.

Latest Updates from Our Project:

Book Update
about 1 year ago – Fri, Sep 29, 2017 at 09:27:13 PM


Our last update was over two months ago, and we are seriously overdue. 

Please forgive us - we've had lots going on, and much of it related to THIS project!

Last time I revealed that the laid out proofs were almost ready, and then we had to review those proofs. That was entirely accurate at the time. 

However, while that version was in layout (which I sent in a previous update as word document downloads for all of you to read), one of our developers wanted to incorporate some changes to a few sections. Unfortunately, doing this at this late stage did require the layout and proofing process to stall, and then revert to an earlier stage of editing. (You cannot add unedited content to a book in layout, it must also be edited, then laid out, then proofread). 

In short, we are now, again, nearly finished with the layout of the book, and then we will go to the final proofread. This did cause a few weeks of unanticipated delay, but it will CERTAINLY result in an even better, more polished product that will stand the test of time. 

I know that many of you will be upset by this further delay. However, there is a really nice silver lining to it all:

The book is so big and heavy, our initial pricing on this Kickstarter was seriously too low. That's great for you! You already paid for it. But we will be increasing the price for future sales due to our increased costs for such a large, heavy book. $35 was simply a steal! There are basically no comparable role-playing books at that price. Thought I'd pass that along!

I will update again as soon as the layout is done (should be very soon), which would mean the ONLY thing standing between you and the PDF download is a quick proofread!

Thanks for your patience as always, 


News and an RPG project to check out
over 1 year ago – Thu, Jul 13, 2017 at 10:23:51 PM


We will be reviewing the layout proofs in a few days!  The review process, as well as revisions for any typos, errors, etc. may take a few short weeks. When that is done, we will immediately send it to you as a PDF, and send the files to the printers.

At that point (when we send the final PDF) we will have an exact timeline for printing and shipping for the physical book. 

Thank you SO much for you endless patience with us. 

The text of the King in Yellow's actual script on Kickstarter?

Well, not quite. However, as fellow fans of weird horror, the Cthulhu Mythos team thought you might want to hear us scream in terror at the Kickstarter for The Yellow King Roleplaying Game. Brought to you by our pal Robin D. Laws and Pelgrane Press, the game takes you on a brain-bending spiral through multiple selves and timelines.

Inspired by Robert W. Chambers’ influential cycle of short stories, The Yellow King Roleplaying Game pits the characters against the reality-altering horror of The King in Yellow. This suppressed play, once read, invites madness. Or a visit from its titular character, an alien ruler intent on invading and remolding our world into a colony of their planet, Carcosa. Four books, served up together in a beautiful slipcase, confront your players with an epic journey into reality horror. The Yellow King Roleplaying Game has already funded and blasted through 25 Stretch Goals. Seize it now with your massive tentacles!

- a Random Brain Cylinder whose number we have not yet determined posted this update. We are trying to find out which one did it. We apologize for any inconvenience. 

Laid out files of book redux!
over 1 year ago – Fri, Jun 30, 2017 at 01:49:17 AM


I sit down after eating lunch and touch my mouse which is resting over the "publish" button on my work in progress update. So, disregard the previous one!

What I meant to say:

While we still do not have a final page count, according to the work in progress laid out files, chapter 3 (out of 10) ends on page 98. This is going to be a very long, very heavy book, very possibly clocking in at over 300 pages. I don't know if it will reach 350, but there's a very good chance. This is massive, and I think the content, layout and art will speak for itself. 

In any case, enjoy these quick images of some of the final laid out content:






Samples of the laid out book!
over 1 year ago – Fri, Jun 30, 2017 at 01:47:16 AM


While we still do not have a final page count, according to the work in progress laid out files, chapter 3 (out of 10) begins on page 58.

over 1 year ago – Sat, Jun 17, 2017 at 12:39:14 AM


In my previous update, I accidentally wrote that it was emailed via CrowdOx. This is because we have used CrowdOx for our pledge manager on almost every Kickstarter - except THIS one. So it was just my error. 

You should have gotten an email via BackerKit, not CrowdOx. I apologize for this confusion!

And as I wrote before, please do not share or give the PDFs or download link to anyone. This is for you as backers, for your patience (and so we can help crowdsource proofreading). 

While Petersen Games generally may want to sow Chaos in the world by Awakening Cthulhu and other great old ones, sharing the results of our hard work for those who did not pay for it will just make it very difficult for us to make more in the future!

Thank you!