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Welcome to the GM's Day sale! From now through March 10th, this title has been marked down by up to 40%! For more values, visit our GM's Day sale page.

TERATOGENICON - our most impressive book so far - is a collection of tables and essays on how to create your own monsters.

It contains one chapter for each of the fourteen most famous monster types (aberrations, beasts, celestials, constructs, and so on). Each chapter examines specific habits, appearance, goals, traits, powers, origins, and many other topics. In addition, the appendixes will help you to create stats (for both old school and contemporary games), to roleplay monsters, and to include all monster types into a coherent whole, among other things.

The book is beautifully illustrated by Rick Troula (of The Displaced fame). Take a look at the previews to see for yourself!

The book is inspired by the most famous RPG in the world (in its current format and by its earlier "old school" version) but is mostly system-less. Use it as inspiration for ANY RPG of your choice, or even for your own stories, comic books, videogames, etc.

Print version now availiable! Notice that the PDF version had a few minor corrections (typos) that haven't been reproduced in the print version yet.

TERATOGENICON - the ultimate monster creator, for ANY RPG system - has arrived! Click the cover below!


DARK FANTASY BASIC - our clone/homage to Basic games! Click the cover below!


These are OSR-compatible! For any old school system of your choice.

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Check all RPG products in our DARK FANTASY line. Mostly system-less, with an OSR vibe.

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And here are our FIFTH EDITION MANUAL OF ARMS books:

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Want to buy EVERYTHING at a discount? Try our BUNDLES:

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Click the image below and see our Chaos Factory Comics products!


 Customers Who Bought this Title also Purchased
Reviews (0)
Discussions (6)
Customer avatar
Duke C June 23, 2022 1:36 pm UTC
I downloaded the preview and encountered issues with the pdf on the DriveThruRPG app. Does this occur with the full pdf? Also using the Mac pdf viewer, the Table of Contents definitely has the misspelling Apendix. Has this been fixed?
Customer avatar
Eric D June 26, 2022 8:16 pm UTC
AFAICT it is a problem with DTRPG; the PDF works fine elsewhere. I'm guessing the full PDF will have the same issues on the app, although I haven't heard of problems using other PDF viewers.
I haven't fixed the typo, sorry, will let you know when I do.
Customer avatar
Eric D August 29, 2022 12:35 am UTC
The "appendix" typo has been fixed! I don't know about the DTRPG app but if there was a problem only on that page, it should be fixed as well. If someone is using this app, please let me know.
Customer avatar
Kerry H March 25, 2021 9:23 pm UTC
any plans for a pod version?
Customer avatar
Eric D March 27, 2021 3:04 pm UTC
Yes! It might take a while but should be available later this year.
Customer avatar
Bruno T June 22, 2020 5:00 pm UTC
Really cool book. Nice material.
Cool illustrations too!
Customer avatar
Eric D June 27, 2020 7:55 pm UTC
Thank you! I'm really glad you like it!
Customer avatar
Derek H June 16, 2020 11:21 am UTC
Looked at the preview and noticed the table of contents is just page numbers. You need to correct that.
Customer avatar
Eric D June 16, 2020 1:51 pm UTC
Hi Derek! Thanks for commenting. It seems to be a problem with DTRPG's preview; there is no issue with the PDF, and even the Quick Preview works fine. If there is any problem with the PDF, we will fix it.
Customer avatar
Derek H June 16, 2020 4:52 pm UTC
Ah, that is interesting. I never have seen a bum preview before.

In any case I do like what I see (text and artwise) and am going to wait for the possible print version. Fingers crossed.
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Product Information
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File Size:
23.42 MB
Original electronic Click for more information
Scanned image
These products were created by scanning an original printed edition. Most older books are in scanned image format because original digital layout files never existed or were no longer available from the publisher.

For PDF download editions, each page has been run through Optical Character Recognition (OCR) software to attempt to decipher the printed text. The result of this OCR process is placed invisibly behind the picture of each scanned page, to allow for text searching. However, any text in a given book set on a graphical background or in handwritten fonts would most likely not be picked up by the OCR software, and is therefore not searchable. Also, a few larger books may be resampled to fit into the system, and may not have this searchable text background.

For printed books, we have performed high-resolution scans of an original hardcopy of the book. We essentially digitally re-master the book. Unfortunately, the resulting quality of these books is not as high. It's the problem of making a copy of a copy. The text is fine for reading, but illustration work starts to run dark, pixellating and/or losing shades of grey. Moiré patterns may develop in photos. We mark clearly which print titles come from scanned image books so that you can make an informed purchase decision about the quality of what you will receive.
Original electronic format
These ebooks were created from the original electronic layout files, and therefore are fully text searchable. Also, their file size tends to be smaller than scanned image books. Most newer books are in the original electronic format. Both download and print editions of such books should be high quality.
File Last Updated:
August 30, 2022
This title was added to our catalog on June 15, 2020.