Bursting Bubble

0-level (Cantrip) Evocation

A small area of the air, no larger than 1 ft. x 1 ft. makes a forceful burst outward in a small sphere. When this effect goes off, the air shimmers at a central point before expanding out in the sphere within the blink of an eye. Any loose items caught in the immediate vicinity are shoved sideways unless they weigh more than 20 lbs., in which case they shutter violently.   Make an attack against a creature. On a hit, that creature hit by this forceful burst takes 1d4 force damage. If the creature is Tiny or smaller, they must make a CON save or be knocked prone.
 
At higher levels: This spell does an additional 1d4 damage at 5th level, with Small creatures now making the save. At 11th level, the damage become 3d4 and can knock Medium creatures prone, and at 16th level, 4d4 damage and can knock Large creatures prone.