Shield Master

You gain the following benefits.

Shield Bash

If you attack a creature within 5 feet of you as part of the Attack action and hit with a Melee weapon, you can immediately bash the target with your Shield if it's equipped, forcing the target to make a Strength saving throw (DC 8 plus your Strength modifier and Proficiency Bonus). On a failed save, you either push the target 5 feet from you or cause it to have the Prone condition (your choice). You can use this benefit only once on each of your turns.

Interpose Shield

If you're subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you can take a Reaction to take no damage if you succeed on the saving throw and are holding a Shield.