Forktail spinal fluid is the name given to two quest items in The Witcher 3: Wild Hunt.

Forktail spinal fluid

Geralt harvests one bottle of forktail spinal fluid during the quest To Bait a Forktail.... The item is automatically added to the inventory during the dialogue with Eskel after killing the forktail.

Associated Quest

Forktail spinal fluid

This bottle of forktail spinal fluid is used to make the Decoctions of the Grasses during the quest Va Fail, Elaine. It can be looted from a chest in Kaer Morhen, along with the other necessary ingredients, after Yennefer tells Geralt to brew the decoctions.

Associated Quest

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