Shield Master

Martial Feat (Prerequisite: Level 4+, Shield Training)

You gain the following benefits.

• Ability Score Increase. Increase your Strength score by 1, to a maximum of 20.
• 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.