The psilocybe is a mushroom which druids employ in their rituals, it is not at all useful in the alchemy witchers practice. The Herbalism skill is not required to gather psilocybes.
The hierophant asks Geralt to get a psilocybe mushroom so he can lure the remaining Salamandra into an ambush. Apparently this would make fisstech even more powerful than it is, so it makes for a very good bait for the planned surprise attack. This must be the distilled ingredient.
- The hierophant.
- Only found in the cave in the Swamp in Chapter III (as the active ingredient of the psilocybe mushroom)
The Skellige Islanders refer to this mushroom as "Mardroeme". It is used to induce hallucinations and is part of the formula deployed to transform the berserkers.