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Reactive Shield 
Feat 1
Source Pathfinder Core Rulebook
Trigger An enemy hits you with a melee strike.
You can snap your shield into place just as you would take a blow, avoiding the hit at the last second. You immediately use the Raise a Shield action and gain your shield's bonus to AC. The circumstance bonus from the shield applies to your AC when you're determining the outcome of the triggering attack.
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.