Thundercrash

You get into a stance as if you were ready to take off like a dragon and propel yourself into the air, controlling the direction you land, bringing the storm with you! You propel yourself in the air surrounded by lightning, the area you take off leaves a thunderous impact, all creatures within 15ft of the take off area that are medium size or smaller will be knocked prone on a failed strength save (14). You can travel up to between 30ft and 300ft dealing 3d12 lightning area damage upon crashing (30 ft cone) 

when you reach 8th level this spell ads 1d12 thunder damage and pushes creatures of medium size and lower by 15ft where you land. also creatures who were within 20ft of the take off are immediately knocked prone, creatures of large size get knocked prone on a failed save.

At 10th level the spells range increases to 500ft with a damage radius of 45ft and an extra 1d12 lightning damage, also large targets get pushed 30ft on a failed strength save.