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The Grand Grimoire of Cthulhu Mythos Magic

Author: Chaosium Inc.

Compendium Expansion: Readable and searchable in all games using this game system, and in the Compendium.

Price: $24.99

Play Call of Cthulhu anywhere. Access your rules, character sheets, and one-click rolls online and in-person.
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Over 500 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.

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.

What's Inside?

A Glimpse of the Magic Inside

Advice on Expanding Magic in your game.

The suggestions within this chapter are intended to provide Keepers with ideas and possible scenario plots with which to confound, delight, and horrify their players. Whether ley lines, areas exposed to magical residue, astrological alignments, or other factors, Keepers are encouraged to expand the use of magic within their games, ensuring that "magic" is never a safe, easy, or understandable process, and that it often comes with unforseen and dire consequenecs.

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.

And how to integrate Folk Magic (or not)

All book assets and information fully integrated for the VTT, including all 500+ spells and 9 monsters with drag and drop support onto the official Call of Cthulhu by Roll20 character sheet.

Accessing Your Content


Which Character Sheet should I use?

All Call of Cthulhu 7th Edition licensed content on Roll20 uses the Call of Cthulhu by Roll20 character sheet.

Bug Reports

If you are experiencing any other issues, please let us know on the Help Center.

Call of Cthulhu: The Grand Grimoire of Cthulhu Mythos Magic © copyright 2015, 2019 Chaosium Inc. All rights reserved. Call of Cthulhu © copyright 1981, 1983, 1992, 1993, 1995, 1998, 1999, 2001, 2004, 2005, 2015, 2019 Chaosium Inc. All rights reserved. Call of Cthulhu, Chaosium Inc., and the Chaosium dragon are registered trademarks of Chaosium Inc.

i Can only be used with Roll20; cannot be downloaded.

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