You can make exceptionally powerful
melee attacks.
Prerequisites: Str 13+
Benefit: On your action,
before making melee attack rolls for a round, you may choose to
subtract a number from all melee attack rolls and add the same number
to all melee damage rolls. This number may not exceed your base
attack bonus or 5, whichever is less. The penalty on attacks and
bonus on damage apply until your next action.
Special: A fighter may select
Power Attack as one of his fighter bonus feats.