Shield Bash

In your hands, a shield is not just a defensive tool, but a formidable weapon, capable of laying your opponents low. You gain the following benefits when wielding a shield:

• While you are wielding a shield, you can make an Attack that does d4 + strength modifier bludgeoning damage. 
• On a successful hit, medium or smaller creatures must succeed on a DC15 Strength saving throw or be knocked prone.
• As reaction, add your proficiency modifier to your AC against one melee attack that would hit it. You must be able to see the attacker and be wielding a melee weapon