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There is a Legacy version here.

PFS StandardAnalyze Weakness [one-action] Feat 6

Rogue 
Source Player Core pg. 172
Prerequisites sneak attack 2d6
Requirements You have identified a creature with Recall Knowledge

Your knowledge of a creature’s physiology helps you attack with pinpoint accuracy. You carefully study a creature that you’ve identified to scope out particularly weak points in its positioning or physical form. The next time you deal sneak attack damage to the chosen creature with a Strike before the end of your turn, add an additional 2d6 precision damage.

At 11th level, the additional damage becomes 3d6, and at 17th level it becomes 4d6.