Blinding Light

As you cast this spell, radiant energy bursts out from your body in every direction. Each creature within a 20ft radius sphere originating from you makes a Constitution saving throw against your spell save DC, taking 3d8 radiant damage and becoming blinded on a failed save. On a successful save, a creature takes half damage and is not blinded. At the beginning of each of its turns after this spell is cast, any target that was blinded by this spell makes a Constitution saving throw and is no longer blinded on a success. However, on a failed save, that creature takes 1d8 radiant damage and remains blinded.