Chosen Foe

(Drow of the Underdark, page 47, DnD 3.5)

[General, Fighter Bonus Feat]

At the expense of attention to other distractions, you focus on a single opponent to give you a decided advantage while fighting against him.

Benefit

Once during your turn as a free action, you can designate a single opponent. You gain a +1 insight bonus on attack rolls made against that opponent and a +1 insight bonus to AC against attacks made by that opponent. In exchange, you take a --2 penalty on attack rolls against other creatures and a --2 penalty to AC against attacks made by other creatures. The bonus and penalty last until the start of your next turn.

Special

A fighter can select Chosen Foe as a fighter bonus feat