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, or take 2d8 thunder damage, and is pushed 10 feet away. On a successful save, the creature takes half as much damage and isn't pushed. Unsecured objects automatically are pushed 10 feet away.