Burst Flash

You target a point on a creature you can see within 60ft. A small flash of light erupts from that point, leaving a burn on the point targeted. If the target was a creature, that creature must make a CON saving throw, taking 4d6 radiant damage on a failed save, and half as much on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 2d6 for each spell slot level above 1.