Thunderous Note

5th level-Level Artificer, Composer Feature

When you hit a creature with a Musical Apparatus attack, you can expend a spell slot to knock Large or smaller targets back with a thunderous burst of sound. The creature is knocked back 10 feet for a 1st-level spell slot, and an additional 10 feet for each spell level higher than 1st-level.
Also, whenever you deal thunder damage, you add your Intelligence modifier (minimum of +1) to your damage roll.