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Malleus Monstrorum - Cthulhu Mythos Bestiary - Slipcase Set

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

Two-Volume Slipcase Set

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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Downloads for this Product

Monster Sheet
Monster Sheet - Writeable
Minion Sheet
Minion Sheet - Writeable

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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Australia: [Y]
Canada: [N]

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PDF Product Name: [Malleus Monstrorum - Cthulhu Mythos Bestiary - PDF]
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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 Slipcase Set (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 Empty Star Empty Star 3
    Malleus Monstrorum

    Posted by Sean Curtin on 7th Nov 2023

    Maybe it was the 4th and 5th editions of Call of Cthulhu that ring wonderful memories of high class productions(the green leatherette with gold embossed elder sign for the limited edition 5th edition was amazing.) Firstly, while I enjoy a few glossy picture pages, I really miss the hard style paper printings like in the 5th edition leatherette printing for example and even the matt paper finish of the previous editions. To have the entire volume in gloss has me nervous to go page flipping to hard as the gloss printing is like that of modern day magazines and easily crinkles if your not ultra careful. The hard cover is nice and the satin book mark is always a wonderful touch, but I just had to come clean about the 7th edition gloss paper printings. Now let's go to the content. It made perfect sense to have a Monsters volume and a Deities volume as the 2 are far removed in terms of abilities and power, however unless your a cultists they are all monsters to be feared for the humble investigator. Firstly the states and comparisons of size, abilities and powers was a much welcomed addition that will provide an excellent resource for planning your Call of Cthulhu adventures for sure. The content was well written and the descriptions adequate but then there's a massive problem. The artwork is simply to scarce. Now take the fabulous 7th edition main rule book. Each monster given a description has a picture, not so with these volumes and worst of all they even re-use artwork resulting in duplicate artwork between the 2 volumes. What was I expecting? Well I nicely laid out set of stats with a portrait picture for each monster for starters, however in my mind there was more. With previous editions of Call of Cthulhu, they used to use excellent tables, boarders and surround graphics to keep the data together. What I would have loved to have seen were some classic picture frame style surrounds for each of the monsters, with the stats next to the pictures. The large full colour monster spreads were lovely, but I would have gladly sacrificed these to make room for setting up each monster with a full picture say in 1/4 of a page size, next to that, a quarter for the stats and major points, then the other half of the pages for description data, perhaps 2 pages to allow for the data on the more illustrious monsters. Also a nice table surround for each of the stats. The picture frame and state table boarders could have been linked via using the same say 20's picture frame surround boarders and you could have used a couple of hundred of these(a different style for each monster.) The data on the monster could have been paragraphed into sections with headings that break the monsters into topics useful for adventures. For example: Geographic/Celestial location. Habits/Traits, Tolerance, Food/Energy source, Ideal Habitat, Weaknesses, Strengths etc. Am I glad this exists? Yes, but not even a picture for each monster, Call of Cthulhu has done this a lot better. To be honest these volumes will require you to have the main rule books(which is probably not going to be a problem as there required for play.) and even a copy of the excellent Sandy Petersens Guide To Lovecraftian Horrors(a really cool book but focusing on descriptions of the monsters, but hey every single monster featured has a nice picture to go with it's decription.) Without these books, your not going to have anything to show players what's attacking them because sadly with 2 volumes, the artwork was truly given a massive back seat. I hope if a 2nd edition is possible, Chaosium can hold off on publishing until they can complete the artwork for the volumes so every monster and deity has a picture no matter how small it might be and that the perfection that was found in previous editions of Call of Cthulhu can be used to assist in making these, well nicer in presentation. I'm giving this release a 3 out of 5 as it feels too hurried from what I've seen, but again, thanks to the writers for making this possible, it was about time and is gratefully received, I just expected a lot more polish for my hard earned dollars and expected more from Chaosium.

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

    Posted by Mordred on 7th Sep 2023

    I honestly could not be more pleased with this product. Physically the books are sturdy and beautifully made, and the content is great. I love the ribbon bookmarks. Great slipcase too. Surprisingly the pdf version doesn't quite do these books justice, holding them in your hand they seem somehow more vibrant. Who knows, maybe they're... alive?

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

    Posted by Celeste on 24th Jun 2023

    I'm just reviewing all my stuff from this store because I adore every purchase, these books are no exception. The objects themselves are high quality! Strong binding, hard cover, no book spine breaking without purposeful harm, and hard to rip paper that feels nice in your hands!! I have sensory issues regarding things that are too dry and grainy, so the high quality paper is a real blessing!! Never saw a single spelling mistake, obvious grammatical error, or misprint in these. It's something that is expected, yes, but it can also be appreciated! I am appreciating it! It's easy to follow, very consumable. I read it cover to cover because I have autism and like TTRPGs a lot and so it was very nice to not have to reread. I got through it quickly, easily comprehended, and was very excited to apply my knowledge to games! It only made me more passionate about the Mythos and only made me want to terrorize my players more <3 Still working on getting my DnD group into horror, but eh, we'll get there.

  • Full Star Full Star Full Star Full Star Full Star 5
    The definitive bestiary for Call of Cthulhu

    Posted by Jason Karns on 16th Nov 2021

    An superb two volume set that expands on the lore of the various Mythos creatures and gods (including possible "blessings" for characters who worship the Great Old Ones, Outer Gods, and Elder Gods). Was expecting some more artwork, but some the of the descriptions for the monsters are simplistic (such as blobs, formless entities, and regular animals corrupted in some way), so I can't in good conscious take away points for that. Pick up a copy to enhance your CoC campaigns or adventures.

  • Full Star Full Star Full Star Full Star Full Star 5
    High Quality Production and Content

    Posted by Scott Edward Nash on 30th Sep 2021

    The Slipcase set is really, really nice. The case itself is thick and sturdy, the books are high quality and each has a ribbon bookmark. The content is where it really shines though, very thorough background information and ideas how to use the Deities and minions in your campaigns. The amount effort to create these manuals must have been a labor of love. There is so much information it is really amazing. Well worth the cost and probably worth more than the asking price. Very happy with my purchase.

  • Full Star Full Star Full Star Full Star Empty Star 4
    Content invaluable, would benefit from more art

    Posted by Dennis Twardy on 9th Sep 2021

    First of all: it's a great product and any Keeper who wants to come up with their own scenarios and adventures basically needs this. It's not so much about the stats but about the cults, the history and the detailed descriptions. It would be a 5+ star product if it just had more art work. I'm not expecting every single creature to be visualized, but there are many pages with barely anything except text. It's invaluable for its content, more art would make it perfect.

  • Full Star Full Star Full Star Full Star Full Star 5
    Beautiful product

    Posted by Steven on 8th Aug 2021

    This is a lovely product. Chaosium's physical products are superior to every other company in the industry. Their books are solidly bound, the pages are heavy and pleasant to the touch, and the writing and artwork are excellent. The slipcase is collector's-item quality. I don't even have anyone to run a CoC game for, but I am glad to have this thing just as a collector and lover of RPGs.

  • Full Star Full Star Full Star Full Star Full Star 5
    Ready for a part 2!

    Posted by Zackary Clarke on 10th Jul 2021

    This book is fantastic! Contains plenty of monsters with detailed descriptions and amazing artwork. I hope the same effort goes into a book detailing monsters of the dreamlands.

  • Full Star Full Star Full Star Full Star Empty Star 4
    Great Reference Book - not enough pictures

    Posted by Morgan Hua on 20th Apr 2021

    The books have chock-full of information. Vol 1 is on creatures. Vol 2 is on each Mythos Deity and their cults, a gold mine of info. The only drawback is most Monster Manuals have an illustration for each creature. This is not the case for this set of books. I'd say 1/3 to 1/2 of the entries have illustrations and most are in sepia tones, not full color. Some of the well-known creatures don't have illustrations and some illustrated in the Keeper Rulebook are not illustrated in this set. Even though the horror should be left to the imagination of Players, as a GM, I'd like an illustration to help me, so I can pick a detail that I can focus on or give as a hint. Some entries are not quite alphabetical, but based on their place of origin, for example: "Tindalos, Hounds of" or "Shub-Niggurath, Dark Young of." Overall, a great set of books in a handsome slipcase.