Shield Combatant

Years of martial training has taught you to make the shield the ultimate tactical tool of combat. While donning a shield you gain the following:

• If you take the attack action this turn, as a bonus action you can shield bash a creature that is within 5 ft of you. Creature must make a Dex saving throw based on your proficiency bonus and your strength. If creature failed the saving throw, they are stunned until the players next turn.
• 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.