Thunderpulse

A loud noise erupts from you as you speak. Each creature except you in a 40-foot-radius Emanation makes a Constitution saving throw, taking 4d10 Thunder damage and being knocked prone on a failed save or half as much damage on a successful one.  A nonmagical object that isn’t being worn or carried also takes the damage if it’s in the spell’s area. At the start of your next turn, You may cause the loud noise to erupt from you again, with the damage reduced by 2d10. You may repeat this each turn until the damage is reduced to 0d10. The damage is reduced by 2d10 each turn.

Using a Higher-Level Spell Slot. The initial damage increases by 1d10 for each spell slot level above 5.