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Combat Assessment 
Feat 1
Source Pathfinder Advanced Player's Guide
You make a telegraphed attack to learn about your foe.
Make a melee 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.
The target is temporarily immune to Combat Assessment for 1 day.
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.
FighterThis indicates abilities from the fighter class.