Coruscating Glimmer

You conjure a small, concentrated orb of light at a point you can see within range.  The orb ignites with a blinding flash, and all creatures of your choice within 30 ft. of the spark must make a Constitution saving throw and take 10d8 radiant damage, or half as much on a successful save. Creatures who fail the saving throw are also blinded for 1 minute. After the initial explosion, all light sources within the area collapse towards the center. The area is completely devoid of light. Creatures that can see through magical or non-magical darkness cannot see through the area, with the exception of you and any creature within 5 ft. of you.