Stone Soul

You’re so attuned to the earth that your skin can harden to the thickness of stone.

Prerequisite(s): Stone giant.

Benefit: Your natural armor bonus increases by 1. Once per day, you can use stoneskin (on yourself only) as a spell-like ability. Your caster level is equal to 1/2 your Hit Dice.

Special: You can take this feat up to three times. Each additional time you take this feat, the number of times you can use stoneskin per day increases by one.