Dr. Kobold's Alarm Clock

Straight from the pint sized physician's machinations you unleash a seismic wave at your target. The target must succeed on a Dexterity saving throw against your spell DC. On a failed save the target is blasted into the air taking 3d10 bludgeoning damage the target is then knocked prone until their next turn. 

On a successful save the target takes half damage and is not knocked prone.

At higher levels the spells damage increases by 1d10 per spell level.