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Sandy Petersen’s Cthulhu Mythos


Note: An overhauled version for v10+ is in production. We're also testing against v11 builds.

Sandy Petersen’s Cthulhu Mythos for 5e is the most comprehensive guide to including Lovecraftian elements in your Roleplaying game, written by Sandy Petersen, the author of the groundbreaking Call of Cthulhu role-playing game. Ghoul Island Saga (Acts 1-4) sold separately. 

This module includes the complete book. Inside you will find new player races from Lovecraft’s universe – Dreamlands Cats, Mythos Ghouls, Gnorri, and Zoogs – as well as new character subclasses, backgrounds, and feats for them. This guide also contains new rules for Insanity and Dread; new rules and skills for occult investigation; 75 new spells and rituals; rules for Formula casting; dozens of mythos items and artifacts; and details on dozens of Mythos cults.

This massive tome also contains over 120 monster stat blocks, dozens of which are Cthulhu Mythos monsters that have never been described for 5e – including new rules for interacting with the Elder Influences of 25 Great Old Ones and Outer Gods (they are much more than a simple encounter!). There are also random encounter tables for all levels of play in a variety of environments., and a Dread Tracker chart as a scene.

This is the definitive guide to Cthulhu role-playing from the master himself.

FoundryVTT Conversion: Clayton Thomson and Scott Kury.

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2 years ago

Hello! Thank you for your work converting this for foundry. I’m using this world hosted on Forge. I wanted to let you know that the pause game spinning icon is broken. If I change the image source using chrome’s developer tools in peterson-games-ghoul.js to my personal asset link for the cthulhu icon.

1 year ago

Hi there! I love this module, but are there plans to update for Foundry 10?

10 months ago

Adding for awareness does not work with version 11.

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