race features:
Natural Armor. While not wearing armor, your armor class equals 13 + your Dexterity modifier. You can equip a shield and still gain this benefit.
Ancient Defensive Stance. As a bonus action, while you have one hand free, you can choose to enter a defensive stance that is centuries old. You add your proficiency bonus to your armor class until the start of your next turn. After using this trait, you must take a short or long rest before doing so again.