Fists of Iron

(Oriental Adventures, page 62, DnD 3.0)

[General]

You have learned the secrets of imbuing your unarmed attacks with extra force.

Prerequisite

Improved Unarmed Strike, Base attack bonus +2

Benefit

Declare that you are using this feat before you make your attack roll (thus, a missed attack roll ruins the attempt). You deal an extra 1d4 points of damage when you make a successful unarmed attack. You may use this feat a number of times per day equal to three + your Wisdom modifier.