Stone Skin

You can manifest hardened stone or crystal on your fists. You gain the following benefits:

• Increase your Strength, Constitution, or Charisma score by 1, to a maximum of 20.
• Your skin harden. While you aren’t wearing armor, you can calculate your AC as 13 + your Dexterity modifier. You can use a shield and still gain this benefit.
• You grow rough rocky protrusions on your hands. Your fists are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal bludgeoning damage equal to 1d4 + your Strength modifier, instead of the normal damage for an unarmed strike.