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PFS StandardChemical Purification Feat 4

Uncommon Additive 2 Alchemist 
Source Knights of Lastwall pg. 83
Frequency once per round
Access Knights of Lastwall have access to this feat.
Trigger You use Quick Alchemy to craft an alchemist's fire or ghost charge, and that bomb's level is at least 2 levels lower than your advanced alchemy level.

You developed a method to chemically purify and consecrate your bombs on the fly. You include this additive mixture when crafting your alchemist's fire or ghost charge. The created bomb deals 1d4 persistent positive damage in addition to whatever damage it would normally cause. As usual for positive damage, this damage harms only undead and creatures with negative healing.


Additive 2:

Feats with the additive trait allow you to spend actions to add special substances to bombs or elixirs. You can add only one additive to a single alchemical item, and attempting to add another spoils the item. You can typically use actions with the additive trait only when you're creating an infused alchemical item, and some can be used only with the Quick Alchemy action. The additive trait is always followed by a level, such as additive 2. An additive adds its level to the level of the alchemical item you're modifying; the result is the new level of the mixture. The mixture's item level must be no higher than your advanced alchemy level.


Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.