Thunder Crash

You gather sonic energy and expel it in a 25ft Cone. Each creature in the Cone makes a CON save. On a failed save, the creature takes 5d8 Thunder damage and is pushed 20ft away. On a success, the creature takes half damage and isn't pushed.

In addition, unsecured objects that are entirely within the Cone are pushed 25ft away from you, and a thunderous boom is audible from 300ft.

As a Magic Action, you create new shockwaves on subsequent turns for the duration of the spell.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 3.