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Malleus Monstrorum - Cthulhu Mythos Bestiary
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Malleus Monstrorum - Cthulhu Mythos Bestiary

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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.

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.

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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.

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)

Cthulhu & Avatars

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Reviews (1)
Discussions (6)
Customer avatar
David D July 20, 2020 11:09 pm UTC
Just want to clarify...are both volumes in the same PDF document?
Customer avatar
Daniel B August 01, 2020 10:31 am UTC
No, it's two seperate PDFs.
Customer avatar
Callum S June 22, 2020 12:00 pm UTC
It pains me that this isn't available for 5e!
Customer avatar
Bobby J July 04, 2020 1:30 pm UTC
There is, it's just not through Chaosium. Sandy had this created -
Customer avatar
Benjamin B July 25, 2020 3:26 pm UTC
D&D and Call of Cthulhu are two vastly different games. That's kind of like saying you wish that a popular video game would play at the local movie theater. They provide extremely different experiences.
Customer avatar
Frank T June 16, 2020 10:10 pm UTC
I believe Chaosium said they were planning for an October release of the printed copy of the books. That being said, they usually put up a thread on their forum for people to post errors they find in their books. I am dying to get the pdf and print out what I need for my games but not when it has a lot of errors that need to be addressed. I will wait until they start editing the book themselves and post updated files (both here and at their own website for the customers who bought it directly from them).
Customer avatar
Fabio S June 17, 2020 7:18 am UTC
Thank you Frank, I did not know about the forum thread
Customer avatar
Frank T June 19, 2020 3:48 pm UTC
You're welcome, Fabio. There is a very large and welcoming fanbase for the game and Chaosium is very active on the forums.
Customer avatar
Fabio S June 23, 2020 9:40 am UTC
It has, indeed, been a pleasure! Thanks again and happy gaming!
Customer avatar
NEIL S June 16, 2020 6:27 am UTC
Will this be POD
Customer avatar
Michael F June 16, 2020 3:45 pm UTC
You'll be able to buy a print copy from Chaosium's website eventually, they always release the pdf version first anyway.
Customer avatar
Michael O June 17, 2020 2:29 am UTC
The printed slipcase edition will be available from Chaosium in October. It will be offset-printed, not POD.
Customer avatar
RODRIGO R June 17, 2020 1:37 pm UTC
There will be time to correct the types some readers noticed, before printing? Please, check Fabio's thread bellow.
Customer avatar
Michael O June 22, 2020 1:57 pm UTC
Yes, we have been correcting the reported typos and errors, and the printed books will be based on the updated PDFs. A new updated PDF will also be available in a few weeks for all purchasers. Many thanks to all that have been sending specific things that need correcting to our thread for this at BRP Central:
Customer avatar
Fabio S June 15, 2020 10:25 pm UTC
I love this supplement... the art is fantastic, and, as usual, content is excellent. However, there are a lot of typos. Here are some examples found in Vol. I, Deities: in the Zoth Ommog entry, the Typical Physical Manifestation box is named Zhar & Lloigor, even though it seems to correctly contain the stats for Zoth Ommog. Lilith is called Lillith in the Typical Physical Manifestation box (TPM box from now on). The TPM box for Dagon & Hydra seems to be cut short (it only arrives to armor, when every other box seems to have immunities and reform time indicated after that). Cythulos is referred to as Cynthulos in the entry title (or maybe is the other way round, I am not a deities expert). And I was not proof reading it, but simply enjoying it. To sum it up: the supplement is beautiful and useful and remains usable even though it is plagued by a rash of little mistakes. It only needs to be polished a little bit to really shine as it deserves.
Customer avatar
RODRIGO R June 16, 2020 12:29 am UTC
I hope they still have time to correct those, before printing the actual book.
Customer avatar
Fabio S June 16, 2020 10:12 am UTC
Well, I have the utmost confidence in their capabilities. The idea was to write this here in the unlikely event they needed some hint (I think they read these comments) - I really think that if I noticed it, someone else on their side will do or has already done that and a new version is bound to arrive soon.
Customer avatar
Fabio S June 16, 2020 10:17 am UTC
Naturally, errors crept in my little message about errors... my fault! The volume about deities is obviously the second and not the first and it seems I am so stupid as to not being able to write an ampersand correctly. Sorry to you all.
Customer avatar
RODRIGO R June 16, 2020 3:13 pm UTC
Chaosium has my complete trust. I'll buy both the PDF and the Slipcase after they make it available.
Customer avatar
Mike M June 17, 2020 8:46 pm UTC
We are correcting any typos/errors found, updating the PDF, before it goes to print. As you can see from your own posts, typos are very easy to include and miss ; ) That's even after professional proofreading before release. But as I say, we are tracking down any remaining errors and fixing them. Thanks
Customer avatar
RODRIGO R June 18, 2020 1:57 am UTC
All good, Mike. Like I said, you guys have our complete trust!
Customer avatar
Fabio S June 19, 2020 6:47 am UTC
Thanks Mike! Like Rodrigo expressed, you have our complete trust. Listing errors here was in a misguided attempt to signal those things to you Chaosium guys. Frank T promptly pointed out that there is a proper Forum Thread for these things, so I went there and checked if my findings were already in your list.
Customer avatar
Daniel P June 15, 2020 1:17 am UTC
I've been waiting so long, and it shall not disappoint... Hail Cthulhu, and everyone else!!
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File Last Updated:
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This title was added to our catalog on June 14, 2020.