Brewing is a line of the Alchemy Skills Tree. Brewing enables the brewing and drinking of witcher potions.
Effect: Increases Potion overdose threshold by 5%. Potion duration time: +5%
Effect: Potion effects don't wear off until potion Toxicity falls to 90% of the maximum level. Potion duration time: +5%
Effect: Imbibing a Potion gives 20% chance of activating the effects of another randomly-selected Potion, without additional toxicity cost. Potion duration time: +5%