Inertial Shot (3.5e Feat)
From D&D Wiki
 Inertial Shot [Psionic]
You can focus your mental energy into a projectile or thrown weapon to increase its damage potential by increasing the force it releases on impact.
Benefit: To use this feat, you must expend your psionic focus. When you expend your psionic focus to use this feat, you must take a -4 penalty on your ranged attack roll on this attack (this penalty applies only for this attack roll). In return you may add half your base attack bonus (rounded up) to the damage roll for this attack.
Special: If you have taken the Greater Psionic Shot feat, you may instead add your full base attack bonus to the damage roll for the charged attack. You may take this feat multiple times, each time the base attack bonus requirement increases by +4 and you may add .5 (or 1 if you have taken the greater psionic shot feat) for every time you have taken this feat multiplied by your base attack bonus to the roll for a ranged attack charged by this feat.