Sandy Petersen's Cthulhu Mythos for Pathfinder

Created by Sandy Petersen

Sandy Petersen's Cthulhu Mythos for Pathfinder
Photo original
2,328 backers pledged $203,503.00 on Kickstarter

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

Raised in Kickstarter
$203,503.00 / 2,328 backers
Raised in BackerKit
$73,427.94 / 2,396 backers

Latest Updates from Our Project:

The Painted Gate!
about 1 year ago – Mon, Jan 09, 2017 at 08:18:41 PM


This is a surprise update - we realized we never showed you what the factory painted gate is going to look like. This was painted by the factory as a sample for us (all the gates are manufactured, but the mass painting is not complete). The original painter was brain cylinder Ian's daughter (who also painted many of the minis for the displays on this Kickstarter). But these images are NOT her painting, they are done in China.

(You got a free one if you backed this campaign for $100+ not counting shipping).







It's water and dirt, around the stone pillars, and the red is blood.
It's water and dirt, around the stone pillars, and the red is blood.

Our theory is that you pour the blood into the tops of the pillars, it runs down and through a hidden channel in the rock it flows up to fill the circle around the sigil in the center, as well as the symbols just inside the circle. The blood on the sigils around the pillars might be painted on separately, but I'm sure it's blood too.

Next Update (this Wednesday)

Later this week we will still do another update with something from inside the book - looks like it's still a race between PC races and cults! Who will win?....

Hastur and Quantum Mechanics
about 1 year ago – Wed, Jan 04, 2017 at 10:46:08 PM

Content from the book!

As we finish up the last parts of the book, cross our t's and dot our i's on the rules and mechanics, and do the actual layout, we promised to show you actual content from the book itself. We will do that weekly until the PDF is ready for delivery (which should only be a few weeks away). 

Today is just a tease from Chapter 8: Great Old Ones and Outer Gods which details each Great Old One, including how they act as encounters (note that most of the GOOs themselves do not have traditional stat blocs - rather, they operate more like environment effects, as they are simply too powerful to be conceived of as true "encounters"). This page is the beginning of Hastur's section:

Don't say his name! Don't even think it!
Don't say his name! Don't even think it!

For legibility:

Note that the page numbers are wrong - this is just apparently the 12th and 13th pages of chapter 8, which, when placed together with ALL the chapters will change according to the magic of Adobe's InDesign.

Also, just to be clear about one thing - Sandy's name on this project and cover is not just a branding thing - the text above was written by Sandy's deranged, feverish fingers. He did not do the actual mechanics and stat blocs, but rather wrote the overwhelming majority of the flavor and designed what each monster's abilities are, and what they can do, etc., as plain text that was translated into PF rules and mechanics by James Jacobs and others. As with any RPG supplement, there are many authors (including me!), but this really is a work from the mind of Sandy - his interpretation of the Cthulhu Mythos (just as advertized).

For next week's tease

I'll give you a choice to vote in the comments. Do you want a page from:

the Mythos Races (e.g., Zoogs; Gnorri; Mythos Ghouls; Cats) ?  

Or a page from the chapter on Cults? 

OR, another Great Old One?

 - Brain Cylinder 7.1.83

Sandy's Surprise
about 1 year ago – Fri, Dec 23, 2016 at 10:21:32 PM

Sandy's Surprise

Sandy Claws (as we call him at home this time of year) surprised the team a few weeks ago by telling us he wanted to commission an entirely new portrait for Cthulhu for the cover of the book. Since close to the beginning of this project, we all thought the cover was going to use the great image of Cthulhu Rising from Cthulhu Wars. However, Sandy believes this book deserved its own image and not a re-use of something from before. 

We had the time to do it, since book content is still being finalized and proof-read. We believed it was going to be complete this week, but life got in the way of our artist and as of right now we only have a work in progress. Brain Cylinder 67.23.8 (Ian) was very particular that we must send a transmission from Yuggoth before we celebrate Solstice, even if it is just a WIP. Since he is a Master-Cylinder, and controls the pain/suffering and relief toggles on my own cylinder, I'm going to show you the initial sketch, and the partial coloring of the book cover:



Where in Carcosa is my book content?

For a few weeks now many of you have been asking for final content - pages of the book with copy and borders, etc. We are in the final stages, but were not quite ready to show that yet. 

After the holidays are over (after New Years), we will resume our weekly updates and show samples of the final book! 

We are super excited about how it has come together and cannot wait to show you, but alas we are not quite yet ready to do so. 

Have a Happy Holidays and a Merry Solstice from Cthulhu!

- Brain Cylinder 83.7.1 (Arthur)

Double Update!
about 1 year ago – Mon, Dec 12, 2016 at 10:01:31 PM

This week we're doing a double update as we weren't able to do one last week.


The miniatures are expected to ship from China on January 18, 2017. The PDF after that – there is a large amount of new content that will be in layout and integrated.

The amount of amazing content Sandy has been putting in has been slightly overwhelming (in a good way). This is the first full RPG book based on the Cthulhu Mythos Sandy has written in decades, and he has lots of innovative thoughts stemming from his deep pondering about the mythos over the years. This has become an outlet for him to unleash his thoughts, and we didn't want to stifle him (unless you consider putting him in a brain cylinder and forcing him to write 24/7 "stifling").


We’ve had a chance to run the adventure at some conventions and in private groups. Major changes and revisions have been done. The biggest challenge has been not making it too long with too many options. Starting in January GMs of the beta test groups will be invited to a conference to discuss the Adventure and to get their initial feedback. Those on the list will be getting an email directly.

Thank you all for your feedback on cats and body slots for magic items. We’ve found historical ‘proof’ that we’re on the right track with that. See the pictures below.

Cat with magical nose ring
Cat with magical nose ring


Another cat with bling!
Another cat with bling!

  - Brain Cylinder 67.23.8 (Ian)

Secrets...Zoog Hands...Cat Earrings...
about 1 year ago – Wed, Nov 30, 2016 at 09:32:07 PM

Can you keep a secret?…so can I.  

I met last week with Erik Mona, Chief Creative Officer / Publisher at Paizo.  Worked out an exciting addition to the book. Thank you Erik! Speculate all you want, but I’m sworn to secrecy (for real) so you’ll have to just be happily surprised when you get your copy. But just wanted to let you know that the book will be even better than promised. 

Earrings Magic Slot. 

As you may have noticed, our cats wear earrings. Not only does it make them look a bit more badass, it also gives them magical powers! To support a non-humanoid PC race (cats) we came up with earrings as a Magic Slot. Why earrings were never a magic slot to begin with is beyond me (Sandy theorizes it’s because not enough game designers wear earrings). But earrings are a Magic Slot now. Magic slots for cats include earrings, rings (on the tail), collar, and possibly something on the lower legs. Magic items for cats are regularly produced in the Dreamlands. Cats will ‘jump’ from the Awakened World to the Dreamlands to trade magic items that they can’t use for ones they can. We’d love to hear your ideas on magic item slots and cats. 

Zoog Hands


As we study the anatomy of Zoogs, their hands must be addressed. Above is a picture of their hands demonstrating the amazing flexibility of its ‘multi-thumb’ configuration. This, among other physical features contribute to the Zoogs' high Dexterity. 

She’s supposed to be the most beautiful women in the UK. I don’t know about that, but she’s the best looking Cthulhu worshipper I’ve ever seen:

  - Brain Cylinder #67.23.8 (Ian)