In His House at R'lyeh Dead Cthulhu Waits Dreaming!


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New Cthulhu Mythos Rulebook from Chaosium Released!

Here are gathered spells drawn from over thirty years of Call of Cthulhu supplements and scenarios —that's over 550 spells of dire consequences, secrets, and unfathomable power!

Inside the Grand Grimoire of Cthulhu Mythos Magic, each spell has been revised for Call of Cthulhu 7th Edition, including optional Deeper Magic for the most powerful of Mythos sorcerers and monsters, with which to beguile and confound investigators.

Jam-packed with advice and guidance on diverse matters including spell names, elements of spell casting, magical components, and astronomical considerations, The Grand Grimoire of Cthulhu Mythos Magic also covers flawed spells, ley lines, folk magic, and the magic of the Dreamlands.

Looking for Pathfinder-flavored Cthulhu goodness? Check out Sandy Peterson's Cthulhu Mythos! This core rulebook features a bestiary with over 100 creatures, monstrosities, and Mythos Entities authoritatively revised and updated for use with Pathfinder, plus Plot Hooks and Campaign starters, information on Mythos Alien and Bizarre Technology, new expansive Insanity Rules, and details on Cults of Cthulhu and the Necronomicon and other blasphemous Tomes, as well as new Rituals, Spells, Archetypes, and Class Options.

Check out all the other great Chaosium products available here on!

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Dark Archive

I have this book and can't say enough good things about it! A great GM resource.

Are the spells appropriately gruesome and dangerous and mind-bending? It's just not Call of Cthulhu unless using magic is less safe than juggling nitro.

Dark Archive

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spell casting should be a last resort imo. and yes some of these spells are brutal.

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