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The Grand Grimoire of Cthulhu Mythos Magic - Leatherette

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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.

Play online with our Licensed Partners

Do you play on a Virtual Tabletop? Our partners offer products for playing this scenario online.

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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Full Color Leatherette
Mike Mason with Matt Sanderson
Cover Artist:
Sam Lamont and Rhys Pugh