Thundershock

A sudden force emenates from a point of your choosing that you can see within range, expanding quickly into a mighty clap of thunder. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 thunder damage on a failed save, or half as much damage on a successful one.

The sound from this blast can be heard by creatures within 1 mile, alerting all to your presence. 

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.