Shield Master Variant

You use shields not just for protection but also for offense. You gain the following benefits while you are wielding a shield:

• If you take the Attack action on your turn, you can use a bonus action to try to attack an enemy with your shield, rolling a d20 + STR mod + Prof Bonus, on a successful hit, you deal 1d4 + STR mod from first level, damage die increasing at 6th, 11th and 16th levels
• If you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you can use your reaction to take no damage if you succeed on the saving throw, interposing your shield between yourself and the source of the effect.