Blinding Sun

You call down a sphere of blazing solar energy. Each creature of your choice within a 20-foot-radius sphere must make a Constitution saving throw:

• On a failed save, a creature takes 7d10 radiant damage and is blinded until the end of its next turn.
• On a successful save, a creature takes half as much damage and is not blinded.
• Flammable objects in the area ignite.

On each turn you can use a bonus action to have the area that you had explode, have a minor implosion again, dealing 2d10 radiant damage.