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
$73,414.49 / 2,394 backers

Learn About Our Project:

Sandy Petersen is the undisputed authority on the Cthulhu Mythos in games as the author of the groundbreaking game Call of Cthulhu, the first game ever to bring HP Lovecraft’s work to the gaming world.

He now proudly presents Sandy Petersen's Cthulhu Mythos for Pathfinder, by Petersen Games. This is the definitive and ultimate guide to bringing Lovecraft to the high fantasy sword and sorcery worlds played using the Pathfinder rule system. 

Your band of heroes can now fight (and maybe even defeat) monstrous horrors and bizarre, inhumanly advanced races in adventures featuring these unique entities, their magics, and the alien technologies accurately portrayed from Lovecraftian works!

We're offering a lot with this Kickstarter. Some of you have asked how to add copies of the book or more sets of miniatures to your pledge. It's easy - just add the price of the item you want to add to your pledge after clicking the Manage button in the upper right corner of this page.

Or just use this convenient copy we made!

For easy reference, here's a list of Add-On prices:

  • Add $35 per print copy of the book
  • Add $70 per Dwellers of the Dreamlands Campaign Collection
  • Add $70 per Former Human Horrors Campaign Collection
  • Add $70 per Cosmic Nightmares Campaign Collection
  • Add $70 per Shadows Out of Time Campaign Collection
  • Add $35 per Primal Horrors Adventure Kit
  • Add $35 per Foulness From the Stars Adventure Kit
  • Add $35 per Shadows Out of Space Adventure Kit
  • Add $35 per Dwellers of the Abyss Adventure Kit
  • Add $15 per Cultist Horde Pack
  • Add $15 per Deep One Horde Pack
  • Add $15 per Mythos Ghast Horde Pack
  • Add $15 per Moonbeast Horde Pack
  • Add $15 per Mutant Horde Pack
  • Add $15 per Tcho-Tcho Horde Pack
  • Add $15 per Mythos Ghoul Horde Pack
  • Add $35 per Designer's Collectors Kit
  • Add $30 per Hero Lab license
  • Add $15 per Glow in the Dark Elder Thing
  • Add $25 per Monster Deck

For example: If you have selected the HERO PLEDGE option and want two extra Horde Packs, just raise your pledge from $200 to $230.


  • A bestiary with over 100 entries, almost half never before seen in a Pathfinder book before.  
  • Over 25 Mythos Entities: Creatures in the Pathfinder Bestiaries I-V now authoritatively revised & updated in this book. Additionally, the original entries as found in the Bestiaries I-V are also included for easy reference and comparison. 
  • Over 50 NEW Mythos Entries: Creatures from the Cthulhu Mythos that have never before been published in any Pathfinder Bestiary.
  • Over 40 'Unusual Suspects': Creatures that could (and maybe should) be in the Cthulhu Mythos, found in the pages of the current Pathfinder Bestiaries. Some have been updated to reflect our new rules. 
  • Adventures: Plot Hooks and Campaign starters by Sandy Petersen and others. 
  • How to run horror in a heroic sword and sorcery setting by Sandy Petersen.
  • Mythos Alien and Bizarre Technology (Stretch Goal; Funded!)
  • New Expansive Insanity Rules (Stretch Goal; Funded!)
  • The Necronomicon and other Tomes (Stretch Goal; Funded!)
  • New Rituals and Spells (Stretch Goal; Funded!)
  • Archetypes and Class Options for Base Classes (Stretch Goal; Funded!)
  • Cults of Cthulhu and Other Great Old Ones (Stretch Goal; Funded!)
  • Mythos Magic Items and Artifacts (Stretch Goal; Funded!)
  • Aklo Language Essay (Stretch Goal; Funded!)
  • Mythos Ghouls as Player Characters (Stretch Goal; Funded!)
  • Mythos Eidolons, Familiars and Animal Companions (Stretch Goal; Funded!)
  • Tcho-Tchos! (Stretch Goal; Funded!)
  • Gnorri as Player Characters (Stretch Goal; Funded!)
  • Advanced Adversaries (Stretch Goal; Funded!)
  • Zoogs as Player Characters (Stretch Goal; Funded!)
  • Mythos Cats and Mythos Cats as Player Characters (Stretch Goal; Funded!)
  • Campaign Launch Adventure (Separate PDF) (Stretch Goal; Funded!)
  • Hero Lab Data Files! (Stretch Goal; Funded!)
Example layout - Not Final.
Example layout - Not Final.

The Pathfinder Roleplaying Game is an evolution of the 3.5 rules set of the world's oldest fantasy roleplaying game, designed using the feedback of tens of thousands of gamers. Since Paizo released the first playtest documents in March of 2008, more than 50,000 gamers have downloaded the rules and posted their feedback, resulting in a year-long open playtest that was the largest in the history of tabletop roleplaying games. Going back to the beginning of the game's third edition, the rules engine that powers the Pathfinder Roleplaying Game have enjoyed more than 15 years of active playtesting and revision. 

Some Cthulhu Mythos has already been introduced in Pathfinder, but we plan to bring an authoritative expertise of Lovecraftian Horror to the game. Our goal is that this book will be the ultimate guide to the Cthulhu Mythos for the Pathfinder Role-Playing Game

Sandy Petersen brought Cthulhu to role-playing games with his groundbreaking game Call of Cthulhu and now wants to bring the Mythos to the high fantasy world of Pathfinder. 

We also believe that no game of Pathfinder is complete without great miniatures, and we have plenty to include in this campaign. These miniatures come fully assembled and ready to be played immediately.

The miniatures are all in scale with Sir Pointsalot and with each other. (Yes the miniatures are really that big.)

The miniatures are all in scale with Sir Pointalot and with each other. (Yes the miniatures are really that big.)

The miniatures are all in scale with Sir Pointalot and with each other. (Yes the miniatures are really that big.)

Designer Pledge

We want to offer a few select backers the unique opportunity to put their mark in the Cthulhu Mythos. You will work directly with Sandy Petersen and his design team to create a creature based on a miniature. 

That creature will be published in Sandy Petersen's Cthulhu Mythos for Pathfinder! As a backer at this pledge, you will have selected a one-of-a-kind Designer Pledge Level. As a member of the design team, your design will forever live on in Pathfinder history!

Meet the Designers

Sandy Petersen's name is synonymous with Cthulhu in gaming. He is a well-known game designer and horror personality. In 1981, he designed the cult game Call of Cthulhu, the very first game to incorporate the Cthulhu Mythos. It has been translated into many languages and is still played worldwide. 

Sandy developed dozens of roleplaying games, campaigns, and supplements. In 1988, he moved on to video games and was a designer on Civilization, Doom, Quake, and the Age of Empires series, among many other games. He inserted tributes to Lovecraft (sometimes hidden) in every game. In 2011, he was Executive Producer on the critically acclaimed movie The Whisperer in Darkness, based closely on the story by H. P. Lovecraft. 

In 2015, he released the famous tabletop boardgame Cthulhu Wars, about the conquest of the earth by the Great Old Ones, and now runs his own small game company. His games have sold tens of millions of copies worldwide, and he has received dozens of awards from the game industry. He is regularly a guest at gaming and horror conventions around the world.

Arthur Petersen has lived and breathed the Cthulhu Mythos with his father for most of his life. Arthur has worked for Petersen Games as the Production Manager for a little over 2 years. His first game as a developer was Cthulhu Wars and its expansions where he helped to test, balance and develop the game. He has been an avid role-player, steeped in the Cthulhu Mythos for over 15 years. 

Ian Starcher has worked in every facet of the game industry on and off for the last 30 years, starting with his stint at Chaosium Inc. Ian is an expert on the Pathfinder system and is Petersen Game's newest team member.

Special thanks to miniatures painters

  • Avalon Starcher 
  • Ben Brownlie 
  • Chris Ewick 
  • Ian Phillips of Iron Tusk Miniatures
  • Kevin Fox 
  • Paul Sanderson 
  • Roy Duffy 
  • Stone Cold Lead 
  • Tim Prow
  • Chase Norton

Photos of painted miniatures by Sheri Starcher.

Cool looking dice provided by Zucati Dice: Minimalist Metal Dice (pre-orders still available on Kickstarter).

Kickstarter Consultant: Gamerati

Graphic Design Help from: Immortal Nights and Shadestream148

Latest Updates from Our Project:

Hastur and Quantum Mechanics
7 months 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
7 months 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!
8 months 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...
8 months 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)

Closing the Pledge Manager + Survey Link!
8 months ago – Tue, Nov 22, 2016 at 06:39:11 PM

As we said in our previous update, we are closing the pledge manager today, November 22nd at 9:00 PM PST (midnight EST).

What does this really mean?

This means we are charging your card for Shipping (plus any upgrades or add-ons you've selected beyond what you pledged for during the KS), IF you have confirmed your pledge. 

If you have NOT yet confirmed your pledge, then your card will not be charged. We will try again next week (we'll let you know), to give you a chance to finalize your pledge. 

IF you did not read this in time, and your card is charged because your pledge is confirmed in BackerKit, but you but still wanted to add something (such as the collector's editions, which people are still scrambling to get!), then you can email support at petersengames dot com and James will take care of you. All is not lost! Your pledge can be Reincarnated. (James is a Druid).

If you can't find your survey, you can get a new link by clicking here. Yes, Right Here!

Brain Cylinder 83.7.1