The Witcher Potions - De Vries' Extract
De Vries' Extract Effects: This potion makes concealed creatures visible.

Preparation: De Vries' Extract is made by mixing ingredients providing one measure each of rebis, aether and hydragenum, and two measures of quebrith; strong, top quality alcohol must be used as a base.

Duration: Short

Toxicity: Medium

The talented sorceress Tissaia de Vries is credited with discovering this powerful potion, which won her considerable renown. The potion improves the imbiber's vision and allows opponents to be detected even through walls.