Needs review
Source: Way of the Ninja

Description: You can deliver crippling blows to an unprepared enemy.

Prerequisites: Void Use, 9th Level Ninja

Required for: Killing Blow

When making a sneak attack against a flat-footed target, you may spend two Void Points to inflict one point of temporary Dexterity damage for every die of sneak attack damage you inflict. A successful Fortitude save (DC equal to damage dealt).