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:

Text link sent!
over 1 year ago – Fri, Jun 16, 2017 at 01:14:57 AM


I've sent the link via CrowdOx. 

A very important note - it should go without saying that a lot of time, work, effort and money went in to making this project. Please do not share these PDFs or the link to anyone. They are for YOU as backers. 

Thank you!

It's here! Well, in TEXT form
over 1 year ago – Fri, Jun 16, 2017 at 01:11:49 AM

Shortly I'll be sending an email via BackerKit that has a link to a folder in my Dropbox containing PDFs of the 9 original chapters of this book (chapter 10 contains previously published versions of various Mythos monsters that we did not create, so I'm not bothering to share those).  

This is now going to layout - which already has borders, styles, fonts, etc.; it will just be a matter of slotting in the text - which is no small task, I might add! But the initial artistic parts of lay out are at least taken care of.  

Note that while this has been edited (with what is termed a HEAVY copy-edit), standard practice is to have a final proofread AFTER layout as well. So, we will do that at the very end also - but in the mean time, if you catch any errors, feel free to note them on this very basic google form; it will certainly help speed up the final proofing after layout!  

Also, since I'm the one who posts these updates (usually), I get to brag here as well. Well, I’ll get to that. Let me back up a bit.  

So, here was our process. Sandy, while a serious veteran of writing role-playing games and supplements, has never written for Pathfinder specifically. But this is obviously HIS (updated) interpretation of the Cthulhu Mythos. So, he generated the ideas and wrote extensive design documents for the chapters and specific sections. He also wrote specific notes, sidebars and essays that have no rules that are essentially retained as he wrote them.  

All the things that require rules and mechanics (which is the majority), had to be “translated” so to speak from Sandy’s design documents into Pathfinder-ness. That was done primarily by two people who I believe did an excellent job – James Jacobs and David Ross. Also, our two main editors, Eytan Bernstein and Erik Scott de Bie actually did a little bit of development as well, but mostly in clarifying and tidying rules things up (you don’t want your editors doing full development, obviously). Like I said, they did a HEAVY copy-edit, and deserve key praise for their work.  

In any case, so that was our basic process. I was fortunate enough to be allowed to do some design as well. So, here I’ll inflate my head like a hot air balloon and say that I did the design for the majority of the spell descriptions and ritual descriptions (though not the basic ritual RULES themselves, which were a collaboration between Sandy and Ian Starcher). I also designed the majority of the various items/artifacts. Of course, a huge amount of these are really based on “classic” Mythos ideas, or even some stuff from Sandy’s Cthulhu Wars. And, of course, Sandy reviewed it all and accepted it with his Mythos stamp of approval.  

I also designed the Byakhee, Dark Young, Dimensional Shambler, Gnoph-keh, Hunting Horror, Leng Spider, Servitor of the Outer Gods, and, my very favorite, the horrific Daughter of Shub-Niggurath. So, I sincerely you hope you really like all of those monster entries. I certainly had a lot of fun designing them. And if you don't like them, well, then you know who to blame! 

Sandy did virtually all the rest of the monster designs (though James Jacobs did a small handful), except for the various “collaborative” designed monsters that some of YOU backers designed (such as the Abyssal Custodian and Eremite, among others)! All the monsters were translated expertly into great stat blocs by James Jacobs and David Ross.  

Sandy designed 100% of the Great Old Ones, and then James Jacobs crafted an entirely new Pathfinder format for them as stat blocs (since they can’t really be encountered in the same way as a “monster”).  

The Races were primarily designed by Sandy, but Ian Starcher, our business manager and brainchild of this project, also lent some design to the PC races (that was his main contribution in terms of design).  

The rest of the book was effectively designed by Sandy, with various additions from James Jacobs and David Ross. We also had minor help from a variety of folks who lent a hand along the way.  

Thank you to all for your long-suffering patience as we finished this massive mythos tome! Man, we should have called it the Necronomicon or something.

The New "Dire" Cthulhu
over 1 year ago – Fri, Jun 09, 2017 at 11:38:13 PM


I just attempted a feature on BackerKit I've never done before, sending y'all a dropbox link containing this image:

Since "normal" Cthulhu is the most powerful and scary entity on the planet....what do we do about him?
Since "normal" Cthulhu is the most powerful and scary entity on the planet....what do we do about him?

Please let me know in the comments if it worked, and you got such an email with a dropbox link. 

This image is just a little gift to you for your continued patience. 

Next week, I'll do the same and include a dropbox link to a folder containing the book's final text. Please do not share it with anyone. 


Arthur - I'm free from my brain cylinder! aahahhahahaha. I have formed a new terrible body!

Small shipping update - US/Western Hemisphere
over 1 year ago – Mon, Jun 05, 2017 at 11:06:21 PM

Straight from our shippers:

UPS came. They took about 20% of the boxes we have for them. Two trucks were filled. UPS left. 

They say they are coming back with more truck(s). I'll let you know when that happens. 

Also... The last of the international packages (in the Western Hemisphere, anyway) are getting picked up now:

Canada still en route in freight. 

No update for the RoW at this time.

A Big Shipping Update + news on the book!
over 1 year ago – Fri, Jun 02, 2017 at 01:19:35 AM


First, over a dozen folks in the US have had last minute address changes. Some we didn't discover until they were already in the mail. If you recently moved, and believe you didn't change your address in time in our system, please email support at petersengames dot com TODAY ASAP!

The shipping of the plastic sets is slowly but surely moving along. We are in the thick of it, and this means that very shortly the long nightmare will be over and everyone will have their orders! Here is a video our US fulfillment warehouse made over the holiday weekend while they worked to package your orders up:

Here are the details for each region:


 Plastic sets still all the way fulfilled, as before.  


Many US orders are already out the door. Our shippers say that the last batch of US orders will be out the door on Monday, June 5th. It’s actually a little better than that – they say all orders should be packed up and ready to go by Friday, but Monday will be the next actual pickup available from the couriers. Since they couldn’t begin until Saturday, May 20th (after sorting SKUs, etc.), this means they are handling the entirety of the pick and pack in about two weeks. For a project of this scale that is quite fast!  

Note that they do NOT print shipping labels until they are actually picking and packing for your box. Why does this matter? Because when the label is printed, your tracking email is generated. (For example, some fulfillment warehouses print all the labels at the beginning of the process, so you would have an email telling you its on the way, but tracking shows no movement for many days because they haven't actually even packed your order!). Our US warehouse doesn't do that, which means when you get your email, it is going to be picked up by UPS the next morning (or possibly the same day) and will actually be on its way to your home.

Also, note that to expedite shipping, some backers (though a distinct minority) are receiving two separate packages in the US. This is not the case for most orders which should get their entire order in a single box.  


Products for orders in Canada are in the process of being freighted to a Canadian fulfillment center. Because of the scale of their operations and the number of Canadian packages they are estimating that Canada backers will have all their orders in the mail by about the same time the last batch of US orders are out the door as well. It is possible US beats Canada by a day or so, but there will not be a significant difference!  


Our European fulfillment center had some hiccups in their logistics and they were not able to begin last week as planned (and no, this wasn’t even related to the bad weather or lack of available trucking as explained previously, but a third issue). Ye gads, sometimes I think Nyarlathotep himself is actually cackling at me.  

In any case, the first orders for EU should be going out this Friday, in two days. They should, however, be able to send it all out within a few days, once it begins (they are a big operation and fairly fast). You should be expecting tracking emails soon for EU.


Australia is still in a bit of a conundrum. Some orders have been sent, if we have all the SKUs associated with your order. The factory made some errors in how many of each SKU they are supposed to send for each region. There were mistakes in the amount of SKUs per product in US, EU, and Australia. However, it ended up such that Australia had fewer than needed, whereas US and EU had more than they were supposed to have.

Needless to say, this has been an additional bonus problem our shipping manager James has had to deal with.  

Now that the US container and EU containers are fully unloaded and counted, we need to freight some products from both EU and the US to Australia in order to be able to fulfill all Australia orders. That will take some time, which means many Australian backers will have to wait a few weeks until they will finally get ALL their rewards.

However, given the delays you've already experienced, we are biting the bullet and sending you partial rewards right now. This will cost us more, but we feel it is worth it to get even a few of your products sooner, rather than have to wait for well over a month to get anything. I will update you when the remaining product arrives in Australia from US and EU, and you will get your remaining SKUs.

If you have any issues at all, please email support at petersengames dot com. But be patient, as James simultaneously handles customer support as well as shipping, and right now he is very busy. He should get back to you in a timely manner, but it may take more than a day. 

What about the book?

Our copy editors are working to deliver the entirety of the book on June 15th. When that happens, I will make an update just for backers in which I will share the book's text with you. You will therefore be able to read it, though without the art and layout. 

As soon as the layout is done we will of course share it with you immediately as well. 

Brain Cylinder #83.7.1