You shout a thunderous word of power that explodes outward from you. Each creature within 20 feet of you (not including you) must succeed on a Constitution saving throw or take 6d6 thunder damage and be pushed 10 feet away from you. A creature that succeeds on its saving throw takes half as much damage and isn’t pushed.

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.