Thunder Blast

You strike your staff on the ground, creating a wave of thunderous energy. Each creature in a 25-foot sphere, originating from you must make a Constitution saving throw. On a failed save, a creature takes 8d6 thunder damage and is pushed 20 feet away from you. On a successful save, the creature takes half as much damage and isn't pushed.

In addition, unsecured objects that are completely within the area of effect are automatically pushed 20 feet away from you by the spell's effect, and the spell emits a thunderous boom audible out to 600 feet.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.