Thunder Burst

You charge up an aura of electricity and thunder that disperses out into a 30 foot sphere. Creatures within that sphere must make a Constitution saving throw, taking 2d6 thunder damage on a failed save and half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.