Hamstring
( Song and Silence: A Guidebook to Bards and Rogues, p. 39)[General]
You can wound an opponents' legs, hampering his or her movement.
Prerequisite
Base attack +4, sneak attack ability,
Benefit
If you hit with a sneak attack, you may choose to forgo +2d6 of your sneak attack damage to reduce your opponent's land speed by half. Other forms of movement (fl y, burrow, and so forth) aren't affected. The speed reduction ends when the target receives healing (a successful Heal check, any cure spell, or other magical healing) or after 24 hours, whichever comes fi rst. A hamstring attack does not slow creatures that are immune to sneak attack damage or those that have either no legs at all or more than four legs. It takes two successful hamstring attacks to affect a quadruped.