Eldritch Shotgun

This magical shotgun does 1d8 force damage in a 20ft cone  but due to user's small size also requires strength saving throw.
On failed save the little Kobold is pushed back 20 feet. On successful save he's only pushed 10 feet back.

The blast deals more damage as you upgrade it at higher levels: 2d8 at 5th level, 3d8 at 11th level, and 4d8 at 17th level.

Strength saving throw can be ignored in creative ways at dm's discretion.