Expert Defender

You have finished your training and have become a master of defense. You gain the following benefits:

• Your Constitution, Strength, or Dexterity score increases by 1, to a maximum of 20.
• While wearing armor you get a +1 bonus to AC.
• You gain proficiency in shields, light armor, and medium armor.
• When you choose this feat, you get a shield or light armor of your choice.
• When a creature you can see attacks a target other than you that is within 10 feet of you, you can use your reaction to impose disadvantage on the attack roll. You must be wielding a shield.