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PFS StandardNumbing Spice Exhalation Feat 4

Additive Alchemist 
Source Tian Xia Character Guide pg. 104

You can mix alchemically preserved peppers into an alchemical food consumable to spice it up with alchemical fire. When the modified alchemical food is consumed, the user’s mouth goes numb temporarily. Once within the next hour, they can spend a single action to breathe a gout of flame in a 15-foot cone. Each creature in the cone takes 1d6 fire damage for every two levels you have with a basic Reflex save against your class DC.

Traits

Additive:

Feats with the additive trait allow you to add special substances to alchemical consumables you create when you use Quick Alchemy to create a consumable (you can't use additives with quick vials). You can add only one additive to a single alchemical item, you can add an additive only once per round, and most additive abilities specify a subset of alchemical consumables you can add them to.