Formula for De Vries' Extract is a scroll in The Witcher that is used to make De Vries' Extract, a potion which makes it possible to spot invisible enemies.
It can be automatically given by Triss after placing the sensors during the quest The Source, or purchased from the following merchants:
- Hermit at his hut in the Fields
- Kalkstein at his laboratory in Old Vizima (during Act V)
Contents[]
- Formula for De Vries' Extract
- De Vries' Extract: makes it possible to spot invisible opponents.
Journal entry[]
- Formula: De Vries' Extract