Shield Master (PHB '24)

General Feat (Prerequisite: Strength or Dexterity score of 13+, Shield Proficiency)

You use shields not just for protection but also for offense. You gain the following benefits:

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

Complete Block. 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 are wielding a Shield, interposing your shield between yourself and the source of the effect.

Ram. 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 10 feet from you, deal bludgeoning damage equal to 1d4 + your Strength modifier, or cause it to have the Prone condition (your choice). You can use this benefit only once on each of your turns.