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The Grand Grimoire of Cthulhu Mythos Magic - Hardcover

2.60 LBS
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Over 550 spells of dire consequences, secrets, and unfathomable power!

Contained within are gathered spells drawn from over thirty years of Call of Cthulhu supplements and scenarios. Each spell has been revised for the Call of Cthulhu 7th Edition game, including optional Deeper Magic for the most powerful of Mythos sorcerers and monsters, with which to beguile and confound investigators.

Chaosium Unveiled: Inside The Grand Grimoire of Cthulhu Mythos Magic

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

Packed full of advice and guidance on diverse matters including spell names, elements of spell casting, magical components, and astronomical considerations. Plus flawed spells, ley lines, folk magic, and the magic of the Dreamlands. Use this grimoire as a resource, a play aid, and as inspiration when designing scenarios. The Grand Grimoire of Cthulhu Mythos Magic is an essential supplement for Keepers of Arcane Lore.

A Glimpse of the Magic Inside

Spell Advice

Advice on Expanding Magic in your game.

Folk Magic

And how to integrate Folk Magic (or not).

Spell - Bind Shoggoth

Spells that should not be cast - Your investigators will face cultists willing to sacrifice their sanity and indeed their very souls to be able to cast terrible spells in the name of their dark and unforgiving masters.

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What The Critics Say

Grand Grimoire ENnie Nomination

Grand Grimoire Reviews

  • "Players have been clamoring for a Call of Cthulhu spellbook for years. Here is, in one single tome, the unspeakable knowledge that is bound to break even the most fortified minds."

    — Antonios S., RPGNet Review.

  • "A treasure trove of info… a near indispensable reference work for practically all Call of Cthulhu Keepers."

    — The Gaming Gang, Thirty Years of Mythos Magicks.

  • "Looks like an old tome of magic - as it should... a great resource when you are running a campaign, and especially when you are writing your own adventures."

    — Geeks-A-Go-Go, The Grand Grimoire of Cthulhu Mythos Magic Reviewed.

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PDF Product Name: [The Grand Grimoire of Cthulhu Mythos Magic - PDF]
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Page Count:
Mike Mason with Matt Sanderson
Cover Artist:
Sam Lamont and Rhys Pugh
  • Full Star Full Star Full Star Full Star Full Star 5
    Fantastic Magic Book

    Posted by Paul Aston on 4th Nov 2023

    This book arrived today and well worth the wait. I myself am looking for some versatility within the roleplay scene. Love Runequest but don't like the tie with a cult, it's the same with D&D and the tie with the class. This book is perfect to use with Basic roleplay, the new basic roleplay just needs supporting products like this. Very versatile with some incredible and fowl spells, would work in a fantasy rpg also. And the quality, it just oozes quality. Well done team!

  • Full Star Full Star Full Star Full Star Full Star 5
    The Grand Grimoire

    Posted by Caligula, the Keeper of Ancient Lore on 19th Aug 2023

    An amazing book that takes you deep inside the magic of Cthulhu. I would say a must buy for both players and Keepers alike. The seasoned investigator ??‍♂️ might use spells ? by now, and also be able to identify many of the foes’ spells. For the Keeper this book ? offers a deep ocean ? of gothic magic that you can throw into your campaign and at the players. Beautiful artwork and high quality book bind. Warmly recommended. ?

  • Full Star Full Star Full Star Empty Star Empty Star 3
    Excellent Book with Production Issues

    Posted by Mike Geib on 26th May 2022

    This is an amazing supplement (gorgeous art, great spell desciptions) and exactly what I wanted; however, the book is deteriorating faster than an actual handwritten tome of antiquity. The binding has already separated, and I'm afraid that within a few more weeks it will have the pages falling out entirely. Worth the purchase, but handle with care.

  • Full Star Full Star Full Star Full Star Empty Star 4
    Magic for a thousand insane investigators

    Posted by Dennis Twardy on 30th Sep 2021

    Pro: Enough magic for all your investigators to go properly insane and become cultists. Probably more than you'd ever need and very helpful accessoire for writing scenarios yourself. Neutral: A few illustrations for ritual drawings and inscriptions would be nice. Con: Would definitely benefit from a different structure (not just everything in alphabetical order but sorted by categories).

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

    Posted by Shane Bauer on 2nd Jun 2021

    Maybe not an essential CoC supplement, but honestly, a Keeper should buy it even if they're only going to lovingly turn the pages and think of horrible ways to mess with their players. TGGoCMM is an unparalleled resource for magic in CoC. Just buy it.

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

    Posted by Unknown on 6th Mar 2018

    This is a beautiful book that could have been just as useful as a simple list of spells like many other companies produce. Chaosium made a real gem here, beautiful to look at as well as being a wealth of fun ideas to use at the table. Must have book.

  • Full Star Full Star Full Star Full Star Empty Star 4
    A damn good book.

    Posted by Unknown on 20th Sep 2017

    + Exhaustive content. Plenty of spells, rituals, potions, ect all. + Solid production values. Full color. Good art and page layouts. +/- Some new systems but could have been further developed. - Everything is lumped together alphabetically. Some separation say between Rituals, Spells, and Item Creation would be helpful, or at the least, some separated indexes. - A listing of all mythos tomes would have made sense to include

  • Full Star Full Star Full Star Full Star Empty Star 4
    great compendium

    Posted by J S on 30th Jul 2017

    all the dark and obscure mythos-magic you could ever want! page directions among the spell categories (chptr 3) is the only thing i feel is lacking. or even better - sort everything according to category instead of alphabetically.

  • Full Star Full Star Full Star Full Star Full Star 5
    My god, it's full of (black) stars

    Posted by Richard Flanagan on 20th Jul 2017

    Gorgeous design; cool little alternate rules like folk magic, ley lines, and spell components; and, of course, scores of awesomely dreadful spells drawn from the history of CoC. (It also makes a fun summer read in the park, but beware picnicking families carrying Elder signs.)