Thunderous Smite

Casting Time: 1 bonus action
Range: Self
Duration: Concentration, up to 1 minute
The first time you hit with a melee weapon
attack during this spell’s duration, your weapon
rings with thunder that is audible within 300 feet
of you, and the attack deals an extra 2d6 thunder damage to the target. Additionally, if the target is
a creature, it must succeed on a Strength saving
throw or be pushed 10 feet away from you and
knocked prone.