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The Malady Codex: Mindflayer Danger
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The Malady Codex: Mindflayer Danger


This supplement is written by medical students with a love for tabletop roleplaying games. Inspired by the vast array of diseases, and the medieval myths that once surrounded them, we embarked on a mission; to enrich other worlds with fantastical diseases.

Deep in each civilization’s roots, there are myths, remedies, and folklore, all revolving around the ailments that affect its people. When each Dungeon Master wants to expand on the details of the societies that unfold before their very eyes, tools that spice up the process become a vital weapon. This supplement will hopefully become one of them, as DMs become inspired by the grim, epic or mundane conditions of the human body and mind.

In this preview installment of Acesius' writings , we dwelve deep into two alien diseases, brought down on us by Illithids! Due to their entirely different nature, Mindflayers and Elder Brains can create diseases that mortals have no way of defending against, which makes them even more horrifying.

Do not underestimate diseases. Part of the Dungeon Master’s art is to be able to stir feelings up in their players, and few human conditions could accomplish that better. Used as a way to advance a storyline, to expand a character arc or to create conflict, the following stories can serve you well!

In this preview book, you'll find content from both Malady Codexes, such as:

  • The Mindflayer Network, an illithid virus that connects its victims senses to an elder brain, leaking information and slowly driving them insane!
  • The Fugue State, a parasitic infection of the brain that forces mortals to run off and offer themselves as sacrifices to the Mindflayer Dragon known as Brainstealer!
  • Details on the origins, symptoms, and cures for all these maladies.
  • Tips on how to implement each one in your games, making your life just a bit easier.
  • The stat blocks for Brainstealer himself, a CR 18 monster with quite a few powerful abilities!
  • A useful table to consult when deciding what specific spells affect what disease.

Give your worlds a touch of fantastical realism and watch as your players dive deep into the stories you create with these tools!

      Illithds in intimate momments with some humanoids because why not: 

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For thrilling adventures from the authors, check out the following adventures: King to an Empty City, where the exploration of a city devoid of life leads up to an epic battle with its king! The Encounter with the Edan Sha, a free encounter against a ruthless gang of thieves and their Helmed Horror. The Necromanteion, an innovative Dungeon Crawl based on the archeological findings of the homonymous Ancient Greek Temple. The Storm King's Barrows, a collection of 10 unique, exciting adventures set in the North.

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Discussions (2)
Customer avatar
James L September 12, 2020 10:58 pm UTC
Yeah, the first bit was enchanting, but then you used air polution as a cheap shot excuse to blame Demonic Virulence on.

WTH?? Lazy, Lame, Lethargic, Leprosy! Leprosy would be a good analogy! Air Polution?? B___ please. You should have seen the air in cities 40 year ago, green, tasting of burnt diesel, and filled with lead.

You're clueless and I certainly won't be rewarding your laziness with my hard cash.
Customer avatar
Jared H January 08, 2020 1:28 am UTC
I recently bought this one but when reading it I saw it only has 9 pages in the PDF and the numbers on the bottom of the pages imply there should be a lot more stuff listed.
Customer avatar
Jason B January 11, 2020 2:57 pm UTC
As we note in the description, this is a preview product of the first two Malady Codex books. It provides samples of some Mindlfayer diseases, as a small taste of the rest of the diseases in our books, which you can find in this site.
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File Last Updated:
April 06, 2019
This title was added to our catalog on April 06, 2019.