Dropping Smite

The next time you hit a creature with a melee weapon attack during this spell’s duration, an echoing boom can be heard up to 300 feet away, the target drops prone, and the spell ends early. If the target has 0 levels of exhaustion when you hit them, they must make a Constitution saving throw. On a failure, the target gains one level of exhaustion.

At higher levels. The target gains an additional level of exhaustion for every two spell slot levels above 1st level.