Wearing this ring of rough stone allows you to adopt a rocky form.
Ring Slot 625,000 gp
While you are petrified, you can make a saving throw at the end of your turn to remove the effect.
Power Daily (Standard Action)
You become a stone statue, gaining resist 25 to all damage and tremorsense 10. You lose all other senses and can take no actions in this form other than a minor action to resume your normal form. If you've reached at least one milestone today, you can spend a healing surge to regain hit points equal to your surge value at the same time you turn into a statue or resume your normal form.
Published in Adventurer's Vault, page(s) 156.