3e SRD:Unavoidable Strike
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Prerequisite: Str 13+, Psionic Fist, base attack bonus of +3 or more.
Benefit: If the character pays 5 power points per unarmed attack, he or she can resolve his or her unarmed attack as a touch attack for purposes of assessing the foes Armor Class. The character must decide whether or not to pay the cost prior to making the unarmed melee attack. The characters hand or fist remains charged for a maximum number of rounds equal to his or her Strength modifier +1 or until the characters next attack, whichever occurs first. If the attack misses, the power point expenditure is wasted.