Thunderous Reprisal

The next time you hit a creature Large or smaller with a melee weapon attack before the spell ends, the attack crackles with electrical force. The target takes an extra 1d6 lightning damage and must make a Strength saving throw. On a failed save, it is pushed 15 feet away from you.

If the target collides with a solid object (such as a wall), it takes 1d6 bludgeoning damage.
If the target is pushed into another creature, that creature can use its reaction to make an opportunity attack against the target.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the lightning damage increases by 1d6 per level.