Torn-out page: Troll decoction is an alchemy formula in The Witcher 3: Wild Hunt that is needed to craft troll decoction.
It can be obtained by reading The World Underground, found at random diagram locations, or purchased from the following merchants:
- Tomira in White Orchard
- Yolar at Gedyneith
- All herbalists in Toussaint except Pinastri
