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PFS StandardKnown Weaknesses Feat 1

Source Advanced Player's Guide pg. 60 2.0

Whenever you Devise a Stratagem, you can also attempt a check to Recall Knowledge as part of that action. If you critically succeed at the Recall Knowledge check, you notice a weakness and gain a +1 circumstance bonus to your attack roll from Devise a Stratagem. If you immediately convey this information to your allies as part of the check, each ally gains a +1 circumstance bonus to their next attack roll against the subject, as long as their attack is made before the beginning of your next turn.