You channel the radiance of the sun into a chunk of sunstone. Until the spell ends, you can use an action to release the stored energy in a 30ft cone radiating out from yourself, destroying the stone in the process. Creatures within the cone must make a Constitution saving throw. On a failure, they suffer 4d6 fire damage and 2d6 fire damage and are blinded until the end of your next turn. On a successful save, they suffer half damage and are not blinded. Creatures who lack any means of covering their eyes or have particularly sensitive eyes, such as Beholders or Doro, are still blinded by this spell, even if they make their save.