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:

• As part of your Attack action on your turn, before or after your attacks to strike your target with your shield, dealing 1d4 + Strength modifier bludgeoning damage on a hit. If you moved at least 20ft in a straight line before taking this bonus action, you instead deal 1d6 + Strength modifier bludgeoning damage on a hit, and the creature must succeed on a Strength or Dexterity saving throw equal to 8 + your Strength modifier + half your Proficiency Bonus or be knocked prone.
• If you aren't incapacitated, you can add your shield's AC bonus to any Dexterity saving throw you make against a spell or other harmful effect that targets only you.
• 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.