Sharksin Armor

The sharp scales that make up your skin grow as tough as chain, and become so rough that they can draw blood. You gain the following benefits:

• Increase your Strength, Constitution, or Charisma score by 1, to a maximum of 20.
• Your scales 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.
• Whenever you successfully grapple another creature or yourself grappled you can chose to deal 1d4 slashing damage to the other creature.