Shield Grand Master

Your mastery of the shield has no equal. You use a shield not just for protection but also for offense. You gain the following benefits while you are wielding a shield:

• If you take the Attack action on your turn, you can use a bonus action to try to shield bash your opponent.  In addition to performing a shove the shield does 1d4 + your Strength modifier in bludgeoning damage. 
• When a creature you can see attacks a target other than you that is within 5 feet of you, you can use your reaction to impose disadvantage on the attack roll. 
• If the opponents attack still hits you can reduce the damage the target takes by 1d10 + your proficiency bonus (to a minimum of 0 damage).