Fist of Stone

You transform one of your hands into a mighty fist of living stone, gaining a +6 enhancement bonus to Strength for purposes of attacks, grapple checks, or breaking and crushing items.   In addition, you gain the ability to make one natural slam attack as a standard action, dealing 1d6 points of damage plus your new Strength bonus (or 1-1/2 times your Strength bonus if you make no other attacks that round).   You can make the slam attack as a natural secondary attack with the normal -5 penalty (or -2 penalty if you have the Multiattack feat; see page 304 of the Monster Manual) as part of a full attack action.   However, you cannot gain more than one slam attack per round with this spell due to a high base attack bonus (+6 or higher).   Your fist undergoes no change in size or form, remaining as flexible and responsive as it would normally be while under the spell's effect.
 

You transform one of your hands into a mighty fist of living stone. All Strength-Based attack rolls and ability checks you make with only that hand are made as though your Strength is 18, if it is not already higher.   In addition, unarmed strikes you make with the hand deal 1d6 Bludgeoning damage rather than the normal 1 point of damage.   Your fist undergoes no change in size or form, remaining as flexible and responsive as it would normally be while under the spell's effect.