Aoth's Magical Gong

You choose a creature within range as the target of this spell as you create a large spectral mallet to hit the creature, that creature  must make a constitution saving throw. On a failure they take 3d10 thunder damage and are stunned. On a success they take half damage and not stunned.

Each creature within 30 feet of the target, and are not deafened, must make a constitution saving throw or take 1d10 thunder damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.