A wave of solid light sweeps out from you. Each creature Of your choice in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 radiant damage and is Incapacitated until the end of your next round. On a successful save, the creature takes half as much damage and isn't incapacitated.

In addition, spell emits a brief flash of brilliant light visible out to 300 feet.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.