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Malleus Monstrorum - Cthulhu Mythos Bestiary - PDF

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That is not dead which can eternal lie,
And with strange aeons even death may die…

Here, shall you know the terrors of the void, the nightmare bringers, and the unspeakable lurkers.

Ancient secrets, whispered lore, and collected facts concerning the alien and otherworldly horrors of the Cthulhu Mythos. A cavalcade of monsters and god-like alien intelligences beyond human understanding, all vividly detailed and portrayed. With over 250 entries to inspire countless adventures.

Chaosium Unveiled: Inside The Malleus Monstrorum Bestiary

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

The information within is designed to bring the creatures and bizarre races of the Cthulhu Mythos to life at the gaming table, as well as all manner of Great Old Ones, Outer Gods, Elder Gods, Avatars, and Unique Beings. Their lore and statistics updated and revised for the Call of Cthulhu 7th edition game (and Pulp Cthulhu). All brought to startling life by the illustrations of expert artist Loïc Muzy.

This two-volume collection is packed with ideas, concepts, and insights to immerse your scenarios and campaigns deep in the heart of the Cthulhu Mythos.

Malleus Monstrorum - Vol 1 - Front Cover

Volume 1: Monsters of the Mythos

From the spawn of Abhoth to yuggs, the monsters of the Mythos are herein described, their lore and statistics updated and revised for the Call of Cthulhu 7th edition game.

With over 150 entries concerning Cthulhu Mythos monsters and alien species, as well as creatures from folklore and animal beasts, this tome supplies a wealth of ideas to bring your campaigns and scenarios life with untold horrors.

Sample Page

Malleus Monstrorum - Vol 2 - Front Cover

Volume 2: Deities of the Mythos

Fundamental truths of the cosmos herein lie, to be used to support and inspire countless adventures by bringing Cthulhu, Hastur, Azathoth, and many others to your games. With over 110 entries concerning Great Old Ones, Outer Gods, Elder Gods, Avatars, and Unique Beings, this tome supplies a plethora of ideas to immerse your campaigns and scenarios deep in the heart of Cthulhu Mythos lore.

While humanity may crave both comfort and truth, only one or the other is possible.

Cthulhu & Avatars

Enhance Your Experience

The Malleus Monstrorum Keeper Deck

Sold separately, the Malleus Monstrorum Keeper Deck provides over 60 monsters on handy tarot-sized cards for quick reference. After studying and selecting the fiendish mythos beast you plan to throw at your players, keep your epic 2 volume slipcase in your library and come to the table with gorgeously illustrated cards with all relevant information at your fingertips!

Learn more about the Malleus Monstrorum Keeper Deck here.

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What The Critics Say

  • "Without doubt, the definitive Call of Cthulhu monster guide... a full-color feast for the eyes and the absolutely essential compendium of Lovecraftian deities and denizens."

    — Andrew Logan Montgomery, Exploring the Otherworlds of Fiction, Magic, and Gaming.

  • "Looking back over twenty-five years of monster volumes for Call of Cthulhu, it's obvious that Chaosium's new two-volume Malleus Monstrorum is not just the best, but miles ahead of its predecessors. It's beautifully designed, gorgeously illustrated, and stunningly complete."

    — Shannon Appelcline, RPGNet Review.

  • "An important entry in the 7th Edition library... the breadth of the project is authoritative and all-inclusive. If I have a question about a Cthulhu Mythos monster this is probably the first place I'm going to go to now."

    — Dave Thaumavore, YouTube Review.

  • "Jaw-dropping... its exquisite art and its refined text make it one of the most striking publications of the current edition. Alongside The Grand Grimoire of Cthulhu Mythos Magic, it will be part of the wish list of all fans of the system."

    — Donjon Master, (review is in Portuguese)..

  • "The Malleus Monstrorum goes deep into the creation of a monster as an experience rather than a known thing... This is an excellent resource for those who want more out of the beasties in their game, or want to take a shot at creating their own cosmic horrors. All in all, Malleus Monstrorum sets an excellent standard for RPG bestiary collections, both now and in the future."

    — Never Read the Latin, Bestiary Review.

  • "9/10 - Malleus Monstorum is an absolute gem... Chaosium delivers a jam-packed two volume reference that blends flavor and mechanics to offer Keepers a detailed accounting of Mythos-based threats."

    — The Gaming Gang, A Monstrous Manual Reviewed.

  • "Five out of five eldritch tentacles – I think the slipcase is worth it just for the first book of monsters alone. What a horrifying and terrifying collection to rend investigators with and threaten to eat the heads of heroes."

    — Charles Dunwoody, ENWorld, Malleus Monstrorum Unboxing.

  • "A ton of great artwork; authoritative breadth and scope... an important addition to the Call of Cthulhu 7th edition library.."

    — Dave Thaumavore RPG Reviews, Malleus Monstrorum: A Call of Cthulhu bestiary that will eat your mind" target RPG Bestiary Review.

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Physical Product Name: [Malleus Monstrorum - Cthulhu Mythos Bestiary - Slipcase Set]
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Rule Set:
Call of Cthulhu 7th Edition
Year Released:
Full Color PDF (2 volumes)
Page Count:
216 and 264
Mike Mason, Scott David Aniolowski, Paul Fricker
Cover Artist:
Loïc Muzy
Interior Artist:
Loïc Muzy
Nicholas Nacario
  • Full Star Full Star Full Star Full Star Empty Star 4
    Almost Perfect

    Posted by Choirchick22 on 28th Sep 2020

    Absolutely stunning amount of information. This is really an amazing addition to my Call of Cthulhu library. However, there is a saddening lack of illustrations. I was hoping that since it was so "Definitive" that it would have images of every monster. Too many pages are all text.

  • Full Star Full Star Full Star Full Star Empty Star 4
    A nice improvement!

    Posted by nicholas Bariola on 1st Jul 2020

    The books are well writen I like the guidelines on making new monsters or gods. It does seem to be lacking in artwork, not that the art work is bad, it just lacks art work. I also miss that they did not write the name of the author or book each quote comes from in the opening descriptions. It was nice to be able to read that quote and then look up the author and the book to see how the monster was in the original story.

  • Full Star Full Star Full Star Full Star Full Star 5
    Malleus Monstrorum

    Posted by Christian Grundel on 15th Jun 2020

    EverythingChaosium has put out for 7th edition has been simply amazing. I have a copy of the 2006 Malleous Monstrorum and this is a drastic improvement. I cannot wait for the slip case hardbacks!

  • Full Star Full Star Full Star Full Star Empty Star 4
    5/5 Design and Monster Rules, But Lack of Many Illustrations

    Posted by JF Baconnet on 15th Jun 2020

    As said in the subject, the design of the books follows the good guidelines of the 7th. But what is really striking (no need of Spot Hidden for it) is the lack of many illustrations (like Shantaks, Serpent People, Servitor of the Outer Gods, Lloigors!! etc...) I know there some are illustrations in the core book, but for a double one that regroup all the Mythos entities, to have at least one mid sized illustration would not be a luxury... The rest is 5/5, but one star less for it.

  • Full Star Full Star Full Star Full Star Empty Star 4
    Good but not perfect

    Posted by Thibault Meyer on 15th Jun 2020

    Very good book with a lot of content. The cover is exceptionally beautiful. However, I regret a little the lack of illustration for each creature. Still, I'm looking forward to acquiring the physical version.