Strength Draining Strike p. 80
Liquid, black energy covers your weapon. As you strike your opponent, this material flows into the wound, spreads along his veins, and leaves him weakened.
As part of this maneuver, you make a single melee attack against an opponent. In addition to dealing normal melee damage with the attack, you deal 4 points of Strength damage. A successful Fortitude save (DC 13 + your Wis modifier) halves this Strength damage, but has no effect on the normal melee damage you deal with the strike.
This maneuver is a supernatural ability.