Tumultuous Smite

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 1d6 lightning damage to the target. Additionally, if the target is a creature, it must succeed on a Strength saving throw or it takes an additional 1d6 thunder damage and is pushed 10 feet away from you and knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial extra damage dealt by the attack increases by 1d6 for each slot.