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"Leeuwenhoek Magnifies Hastalÿk's Avatar"

Hastalyk (alternate spellings: Hastalÿk, Pazuzu; AKA "The Plague", "Angel of Disease", "Prince of Disease", "Lord of All Fevers and Plagues", "One Who Shuns the Light", "Grinning Dark Angel of the Four Wings')

Origin: Chad Bowser for Malleus Monstrorum (English version)

In the Mythos

One of the most insidious and powerful Great Old Ones, Hastalÿk is the embodiment of disease. When great epidemics or even localized outbreaks of a disease occur, Hastalÿk may be to blame. Hastalÿk is not the disease, but instead acts as an amplifier for a native contagion. It turns an outbreak into an epidemic.
— Chad Bowser, "Hastalÿk" (Malleus Monstrorum entry)

An insidious and powerful Great Old One said to be the embodiment of, or amplifier of, disease. The avatar of Hastalÿk is said to only be visible through a microscope, but no sane researcher, scholar, or epidemiologist may say what Hastalÿk looks like, as it shatter's one's sanity to look upon this great old one.

Heresies and Controversies

Woodcut: "Hastalÿk Knocks..."
  • "Pazuzu, Lord of all fevers and plagues, grinning Dark Angel of the Four Wings, horned, with rotting genitalia..." (The Simonomicon)

I call forth the god Pazuzu
I call forth the lord of plague...
Rise spread disease
Consume their puny souls...

They call the prince of disease, messenger of the Absu
Carry through the icy winds our curse upon their church...
Sudden death throws off the balance that's within the sky
Priest calls forth infernal names to the ones beyond the gate
Angel of disease one who shuns the light!
Shug-Niggurath, Goat with one Thousand Young!

— "Lord of All Fevers and Plagues" — "Angel of Disease" by Morbid Angel, after The Simonomicon

Keeper Notes

  • As of 2018, there do not appear to be an stories or scenarios published about this Great Old One, and most known information about it can be found primarily in Malleus Monstrorum, along with a few expanded details in Terror Australis.


  • There are no organized cults dedicated to Hastalÿk, though lone cultists or disorganized bands of cultists may invoke this entity for specific destructive purposes; Hastalÿk is resistant to control, and is highly dangerous to summon, especially for the summoner.

Associated Mythos Elements