Thunderwave

Casting Time: 1 action. Range: Self (15-foot cube). Duration: Instantaneous. A wave of thunderous force sweeps out from you. Each creature in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 thunder damage and is pushed 10 feet away from you. On a successful save, the creature takes half as much damage and is not pushed.