Shattering Strike( Epic Level Handbook, p. 66)
You can shatter objects with your unarmed strike.
When using an unarmed strike to attempt to break an object with sudden force (rather than by dealing normal damage), make a Concentration check rather than a Strength check. The break DC remains the same. Using Shattering Strike is a full-round action that incurs attacks of opportunity. You can't use Shattering Strike to escape bonds (unless you are so bound as to allow you to make an unarmed strike against your bindings, such as when you are bound by a length of chain).