3e SRD:Deep Impact
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Deep Impact [Psionic]
Prerequisite: Str 13+, Power Attack, Psionic Weapon, base attack bonus +3 or more.
Benefit: If the character pays 5 power points per strike, he or she can resolve his or her melee attack with a weapon 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 melee attack. The weapon remains charged for a maximum number of rounds equal to the characters Strength modifier +1, or until the character makes his or her next attack, whichever occurs first. If the attack misses, the power point expenditure is wasted.