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Instructive Strike 
Feat 4
Source Pathfinder Dark Archive
You attack your foe and analyze how it reacts. Make a Strike. On a hit, you can immediately attempt a check to Recall Knowledge about the target. On a critical hit, you gain a +2 circumstance bonus to the check to Recall Knowledge.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ThaumaturgeThis indicates abilities from the thaumaturge class.