From PathfinderWiki
Cytillesh spores
(Alchemical item)

Source: Alchemy Manual, pg(s). 11

Cytillesh is a dangerous type of Darklands fungus also known as brain mold. It gives off a bright blue glow equivalent to torchlight.1


Cytillesh is prized by the deros, who appreciate its benefits and are not fazed by its severe detriments, which include stillbirths, birth defects, and insanity. As such, it commonly grows on the walls and ceilings of dero communities. Not all of its health effects are harmful, however, as prolonged exposure can purportedly slow aging by half. Deros also believe it provides mental enhancement and is responsible for creating exceptional deros they refer to as savants.

Deros brew powerful poisons from the mold known as cytillesh extract,2 and cytillesh oil.3 Dero alchemists frequently use the spores of the cytillesh fungus in their crafts. The spore is a versatile alchemical reagent and often combined with other poisonous elements to create deliriums, hallucinogens, and psychotics. As an alchemical power component, it is associated with boosting the effectiveness of enchantment spells, and costs 5 gp per dose.4


For additional as-yet unincorporated sources about this subject, see the Meta page.

  1. James Jacobs & Greg A. Vaughan. “Exploring the Darklands” in Into the Darklands, 12–13. Paizo Inc., 2008
  2. James Jacobs, et al. Classic Horrors Revisited, 8. Paizo Inc., 2010
  3. Logan Bonner, et al. “11: Crafting & Treasure” in Core Rulebook, 550. Paizo Inc., 2019
  4. Jason Nelson, et al. Derro Fungus Alchemy” in Alchemy Manual, 11. Paizo Inc., 2014