Torn-out page: Wyvern decoction

Torn-out page: Wyvern decoction is an alchemy formula in that is needed to craft wyvern decoction.
It's a possible spawn at a random diagram location or purchased from the following merchants:
* Otto Bamber at the Herbalist's Hut northeast of Oxenfurt
* Yolar at Gedyneith
* All herbalists in Toussaint except Pinastri 
It can also be obtained by reading the book Death From Above, which however doesn't appear during gameplay.
== Notes ==
* This formula was also intended to be sold by some generic Novigrad merchants, but the store definition that has it is unused.
ru:Вырванная страница: Отвар из виверны
Category:The Witcher 3 alchemy formulae