You can bash things to damage nearby opponents.

Prerequisite(s): Str 15, Improved Sunder, Power Attack.

Benefit(s): When you attempt a Strength check to break an object that can shatter (nothing made of paper, cloth, leather, or other soft, pliable material), you gain a bonus on the Strength check equal to your base attack bonus. If you surpass the object's break DC, you can send shards of its material f lying out in all directions, dealing an amount of piercing, slashing, and bludgeoning damage equal to 1d4 plus 1 point per point of the object's hardness to all creatures within 10 feet of the object, including yourself.

A successful Reflex save (DC = 10 + 1/2 your Hit Dice + your Strength modifier) halves the damage.