SRD:Greater Psionic Weapon

Greater Psionic Weapon [Psionic]
You can charge your melee weapon with additional damage potential.

Prerequisite
Str 13, Psionic Weapon, base attack bonus +5.

Benefit
When you use the Psionic Weapon feat, your attack with a melee weapon deals an extra 4d6 points of damage instead of an extra 2d6 points.