Geralt begins the game with one Lapwing potion. But to brew more of them, he must find or purchase the formula.

Journal entry

Just as Gadwall regenerates Vitality slowly but consistently, Lapwing restores Vigor. The potion's effect is stronger than that of Tawny Owl, but it produces some side effects. Lapwing intensely weakens the body, reducing the witcher's Vitality and resistances. To strengthen themselves, witchers take Golden Oriole and Swallow together with Lapwing.
Potion causes serious intoxication when imbibed.
The potion is mainly used by witchers who specialize in casting Signs in combat, and by those preparing to fight monsters that perform strong attacks which must be parried.
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