Torn-out page: Foglet decoction

Torn-out page: Foglet decoction is an alchemy formula in and is needed to make foglet decoction.
It's a possible spawn at a random diagram location or purchased from the following merchants:
* Books merchant in Hierarch Square
* Yolar at Gedyneith
* All herbalists in Toussaint except Pinastri 
It can also be obtained by reading Of Water and Fog, but the book doesn't appear during gameplay.
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Category:The Witcher 3 alchemy formulae