The formula for this potion must be acquired before it can be brewed.

Journal EntryEdit

Created by Herbert Stammelford, a famous member of the first Conclave, this brew is readily used by witchers who rely on magic, since it augments the intensity of Signs – the damage done by the Igni, the impact of the Aard, the defenses of the Quen, and so on.
Unfortunately, the potion taps the witcher's Vitality for its power, thus reducing it. Witchers compensate for this loss by consuming the Swallow potion.
The potion moderately increases Toxicity when imbibed.
It is recommended for witchers who rely more heavily on magic than on traditional weapons, and before any fight against monsters vulnerable to the special attacks issuing from Signs.