Brightbeam

A beam of golden light shines down in a 5-foot-radius, 20-foot-high Cylinder centered on a point within range.Bright light fills the Cylinder and it sheds Dim Light for an additional 50 feet. This light is sunlight.

When the Cylinder appears, each creature in it makes a Constitution saving throw, taking 2d8 Radiant damage on a failed save or half as much damage on a successful one. 

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