Shield Mastery

You've mastered using a shield to defend your allies as well as yourself, strategically imposing your shield to capitalize on its protection. You gain the following benefits:

• If you aren't incapacitated, you can add your shield's AC bonus to any Dexterity saving throw you make against a power or other harmful effect.
• While you are wielding a shield with which you are proficient, when you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, and you succeed on the saving throw, you can use your reaction to take no damage.
• When a creature you can see damages you while you are wielding a shield with which you are proficient, you can use your reaction to reduce the damage by an amount equal to your proficiency bonus.