Crystal Scales

You manifest magical crystal scales reminiscent of gem dragons. You gain the following benefits:

• Increase your Dexterity, Constitution, or Charisma score by 1, to a maximum of 20.
• You gain a layer of fine crystalline scales over your skin. While you aren’t wearing armor, you can calculate your AC as 14 + your Dexterity modifier. You can use a shield and still gain this benefit. 
• You can cast the shield spell a number of times equal to your Charisma modifier. (minimum of 1)