Sylveo's Thunderous Forcewave

You create a beam of force energy that strikes within a 20-foot line originating from yourself. Any creature within the line must succeed on a Dexterity saving throw or be pushed 10 feet away from you in a straight line and then be knocked prone.

This spell creates a thunderous boom audible out to 100 feet, and a visible disturbance in the air where the force wave passes.

This spell's range and knock back increase when you reach 5th level (30-foot line, 15 feet), 11th level (40-foot line, 20 feet), and 17th level (50-foot line, 25 feet).