Air Blast

A strong gust streaks toward a creature within range. Make a ranged spell attack against the target. On a hit, it takes 2d4 force damage, and if the target is flying, make a dexterity saving throw, if the total is below 5, the target will fall out of the sky and will not be able to fly for half a minute. If the total is below 12, the target will get knocked 1d10 feet in the air in the direction opposite to the caster of the spell. (knockback)   

The spell's damage increases by 1d4 when you reach 5th level (3d4), 11th level (4d4), and 17th level (5d4).