Shrike (potion)

"Shrike — the potion of revenge — mutates the blood itself. Whosoever spills a drop of Shrike-laced blood will earn a measure of pain in return."

The Shrike potion inflicts pain on assailants during combat.

Source[]

Shrike is a bird of the family Laniidae, and sometimes they are called butcher birds.
"Shrike" is the nickname given to Renfri, a character in "The Lesser Evil" short story.

Potions in The Witcher

Regular potions	Bindweed Black Blood Blizzard Cat De Vries' Extract Full Moon Golden Oriole Kiss Maribor Forest Perfume Petri's Philter Shrike Swallow Tawny Owl Thunderbolt White Honey White Raffard's Decoction Willow Wives' Tears Wolf Wolverine

Mutagenic potions	Dagon Sap Frightener's Vision Golem's Pith Hellhound's Soul Kikimore's Ire Koshchey's Core Striga's Urge Werewolf's Wrath Zeugl's Vigor

Miscellaneous	Fisstech Lycanthropy potion Potion for Triss White Gull