You raise up your shield in time to block all attacks.
Prerequisite(s): Shield Focus, Block, 8th-level warrior or BAB +11.
BENEFIT
Whenever you are wielding a shield, a number of times equal to your Dexterity modifier per round, as a free action (usable outside your turn), you can impose the Unlucky status effect on a number of physical attacks made against you. You must be able to see the attacks coming to use this feat.