Psionic Fist

STR 13,

Your unarmed strikes deal +1d4 points of bludgeoning damage when you pay the cost of 1 power point. You must decide whether or not to pay the cost prior to making the melee attack. Your hand or foot remains "charged" for a maximum number of rounds equal to your Strength modifier + 1, or until you make your next attack, whichever occurs first. If your attack misses, the power point expenditure is wasted.

You can charge your unarmed strikes with additional damage potential.