Kris Vanhoyland
Belgium
Genk
Limburg
@RetakeME3 - We deserve a better ending!
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Poison Use is a class feature given to Alchemists, Assassins and Ninjas. I don't think there is a feat that gives that same ability, since Paizo is usually very careful not to create feats that give a character a class feature of another class.
However, any class can apply poison to a weapon, they just risk exposing themselves to it.
PFSRD wrote:
Whenever a character applies or readies a poison for use there is a 5% chance that he exposes himself to the poison and must save against the poison as normal. This does not consume the dose of poison. Whenever a character attacks with a poisoned weapon, if the attack roll results in a natural 1, he exposes himself to the poison. This consumes the poison on the weapon. Characters with the poison use class feature do not risk accidentally poisoning themselves.