You make a single attack that deals significantly more damage than normal.
Prerequisites
Base attack bonus +6.
Benefit
When you use the attack action, you can make one attack at your highest base attack bonus that deals additional damage. Your attack deals extra precision damage equal to your weapon’s damage dice. This stacks with other sources of precision damage.
For example, if a fighter with 16 Strength and a +2 flaming longsword used this feat, his would deal damage equal to 1d8 [longsword (slashing)] + 3 [Str mod] +2 [enhancement] + 1d6 [fire] +1d8 [precision (slashing)].