Master Feint (3.5e Feat)
From D&D Wiki
Master Feint [General]
Your are an expert at feinting your opponent.
Benefit: You gain a further +2 bonus on Bluff checks to feint, and you can use your Dex bonus rather than your Cha bonus for the check. You deal an extra 1d6 damage on the first hit against a successfully feinted opponent, but only to those opponents who are not immune to critical hits.
Normal: You bluff with your Cha mod and don't deal extra damage.