Gladiator

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

• Your Constitution is increased by 1.
• You become proficient in shields if you are not already.
• While you are wielding a shield, it is considered as a one-handed melee weapon with which you are proficient with, allowing you to make attacks with it as a bonus action. When you attack with your shield, it deals bludgeoning damage equal to 1d4 + your Strength modifier, but the AC bonus it provides is reduced by 1 until the start of your next turn. Alternatively, when you attack with it, you can instead use the attack to shove a creature within 5 feet, adding the shield's full AC bonus to the Strength (Athletics) contest.