Shattering Spree

Izzet League, Cult of Rakdos, Boros Legion, and Gruul Clans Spell (?)
Level 1
Casting Time: 1 Action
Duration: Instantaneous
Range: 60 ft. 5 ft Radius (?)
Create a 5 ft radius explosion of Sound energy at a point within range. Any creature caught within this must make a Constitution Saving Throw or take 3d4 (?) Thunder Damage on a fail (and half as much on a success).
For each level above 1 that this spell is cast at, create a separate 5 ft radius explosion of sound energy at a point within range. Creatures effected by more than one explosion take a separate save for each explosion they are caught in.