Deadly Finish

Deadly Finish (Combat)
Your attacks don’t just fell your opponents—they kill them outright.
Prerequisite: Base attack bonus +11.
Benefit: When you hit with a melee attack and reduce your opponent to –1 or fewer hit points, you can force that opponent to succeed at a Fortitude save (DC 15 + the damage your attack dealt) or die.

(BAB +20): Your opponent suffers a -4 penalty to their saving throw.

OPEN GAME LICENSE Version 1.0a - All text is Open Game Content.