Water hag decoction is a potion in The Witcher 3: Wild Hunt.
- The effect works very well with Invigoration as both require Geralt to remain at full health.
- The effect will not trigger if Geralt is suffering from damage due to toxicity, even if he has enough regeneration applied to out-heal it. This happens because his HP must be at maximum for the effect to work and due to the damage his HP will always be 1 point below maximum no matter how high the regeneration is. However, this can be avoided by unlocking Heightened Tolerance.
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