Reactive Shield [reaction] (Feat 1)
Fighter

Trigger An enemy hits you with a melee Strike.
Requirements You are wielding a Shield.

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.