Blinding Radiance

A burst of blinding radiant energy explodes from you in a 15 foot radius. Every creature within range must make a DEX save. On a failed save they take 6d6 Radiant damage and are considered blinded. On a successful save they take half as much damage and are not blinded.

Whenever a creature starts its turn in or enters the radius for the first time on their turn they must make the same save or also be blinded.

A creature is blinded for as long as they remain in the radius and stay blinded until the end of their next turn after they leave the radius. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.