Shield Master (Revised)

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

• If you take the Attack action on your turn, you can use a special attack with your shield in place of one of your attacks. This attack uses your Strength ability modifier. The weapon's damage die for this attack is a d4, and it deals bludgeoning damage. Additionally, if the target is Large or smaller, it must make a Strength saving throw (DC 8 + your proficiency bonus + your Strength). On a failed save, you knock the target prone or you push the target up to 10 feet away (your choice). 

• 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.

• 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 and half damage on a failed saving throw, interposing your shield between yourself and the source of the effect. Additionally, you can forgo using this effect on yourself to protect a creature within 5 feet of you allowing them to take no damage if they succeed on the saving throw and half damage on a failed saving throw.