Psilocybe Mushroom
From Witcher Wiki
A rare hallucinogenic mushroom, favored by the hierophant of the Druids' Grove.
This mushroom is a quest item required by the Hierophant in the Druids' Grove as part of the Diplomacy and Hunting quest. It contains the special ingredient, Psilocybe, which can apparently be used to increase the potency of fisstech.
