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Petersens Field Guide to Lovecraftian Horrors - Hardcover

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A Field Observer’s Handbook of Preternatural Entities and Beings from Beyond The Wall of Sleep!

Chaosium Unveiled: Inside Petersen's Field Guide to Lovecraftian Horrors

Watch the unveiling video to see the book for yourself. Remember that you get the PDF when getting the physical copy.

Weird shapes in the park? Odd rumbling noises in the basement? A lurking dread in the kitchen? Bad dreams involving strange adventures and bizarre creatures?

Identifying the lurking horrors of the Cthulhu Mythos is never an easy task, so researchers need all the help they can get—don’t leave home without the Field Guide!

What's Inside

Penned by Sandy Petersen, the creator of the Call of Cthulhu roleplaying game, Petersen’s Field Guide to Lovecraftian Horrors is the essential spotter’s guide for the budding and experienced preternaturalist.

Marvelous Monsters

Deep One

Over 50 beasts of the Cthulhu Mythos are detailed and categorized with background information, size comparison charts, habitat and lifestyle notes, and much more. Each entry is accompanied by a full-colour illustration of the dreaded entity.


Rules Free


Petersen’s Field Guide To Lovecraftian Horrors is completely rules-free. You can use it to inspire your own Call of Cthulhu (or RuneQuest or 7th Sea!) scenarios, or the book itself can be used as an in-game prop—a tome of forbidden knowledge!


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What The Critics Say

2017 ENnie winner - Petersen Guide for best monster and interior art

  • "One of the most gorgeous books of this type that have ever been published for a role-playing game."

    — Antonios S, RPGNet Review.

  • "A lovely hardback… full colour, muscular and imposing, weird and unearthly, strange and shocking. …attractive to own, sometimes to peruse, sometimes to show off, sometimes to inspire."

    — Reviews from R’lyeh, Horrors for Halloween.

  • "There are Cthulhu Mythos monster books aplenty, but Petersen’s Field Guide stands out."

    — Graeme Davis, My Top Five RPG Monster Books.

  • “I bought this book for the artwork, but found that the text was delightful… It’s a coffee-table book for people who love monsters. Sure, any Keeper worth their salt will filch the art to show to their players at the game table, but this tome’s natural habitat is in the vicinity of a couch, on a rainy day, with the aroma of coffee wafting across from the kitchen. Enjoy.”

    — Stygian Muse, Petersen’s Field Guide to Lovecraftian Horrors.

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PDF Product Name: [Petersens Field Guide to Lovecraftian Horrors - PDF]
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Page Count:
Color Hardcover
Sandy Petersen, Mike Mason
Loic Muzy, Mariusz Gandzel, Claire Delepee
  • Full Star Full Star Full Star Full Star Full Star 5
    Absolutely Gorgeous

    Posted by Dennis Twardy on 9th Sep 2021

    Unlike the Malleus Monstrorum this Field Guide to Lovecraftian Horrors does not intend to be a compendium of Mythos creatures. It is exactly what the name suggests, a field guide some fictional person might have accumulated over years and years of research and studies (probably going more and more insane in the process). The art work is simply put stunning and gorgeous, a pure joy to look at. Yes, not all monsters, let alone gods are in it. Which makes sense, since the fictional person drawing and writing the articles would have to encounter that being and encountering Cthulhu would probably not end too well. If you'd want to make this even more better or special: a limited edition as a leather bound notebook with a cord locking it all together would be simply amazing. The perfect prop for when investigators might stumble upon the research of a deceased character with profound Mythos knowledge.

  • Full Star Full Star Full Star Full Star Full Star 5

    Posted by Fredrik on 14th Dec 2016

    I bought this book for the art only, to have images of some of the Mythos that doesn't exist anywhere else on the internet but in this PDF. I can without problems say that the art was worth the price alone. In this book are also a page worth of Habitats, what the mythos eat/if they eat and a physical description of each creature within the book. It's not a must have, but it's a very good book for people who appreciate the art and some light lorebits of the mythos in this setting. Loïe Muzy, Mariusz Gandzel and Claire Delépée have managed to paint art of IMPOSSIBLE CREATURES and did a more then well done job, fantastic!

  • Full Star Full Star Full Star Empty Star Empty Star 3
    Little Bit Disappointing

    Posted by Maxwell Osenbach on 15th Sep 2016

    When I first started reading it I was very impressed by the illustrations and narratives accompanying them. I finished the book in a few hours but by the end I realized some things were missing. First and most prominent: Cthulhu is NOT in the book! I have no idea why but this feels like a serious oversight. A few other deities such as Hydra and Dagon are also missing and and quite a few others. Overall this book is alright and the effort is commendable but missing such important figures is REALLY disappointing.