Arcane Shockwave

You unleash a shockwave of raw arcane force, blasting all creatures in a 15 ft. Cone. Each creature must make a Constitution saving throw, taking 5d6 Force damage on a failure, or half as much damage on a success. 

On a failure, a creature also has Disadvantage on saving throws it makes to maintain Concentration until the end of your next turn. 

Using a Higher-Level Spell Slot. The damage increases by 2d6 per level of spell slot above 3.