You have a knack for ducking at just the right moment.
Prerequisite: Character level 3rd, any luck feat.
Benefit: You can expend one luck reroll as an immediate action to force a foe to reroll a critical hit confirmation roll made when attacking you.
You can expend two luck rerolls as an immediate action to force a foe to reroll an attack roll made against you.
You gain one luck reroll per day.
Special: Unlike other luck feats, you can use this feat after seeing the success of the roll to be affected.
Source: Complete Scoundrel, page 73.