Abyssal shriek

You screech as loud as you can and spew out a 20-foot cone of white light.

Everyone in range must make a Dex save equal to you spell save modifier dealing 10D4 Radiant damage on a failure half on a success.

This also emits a bright light of 30 feet and dim for an additional 30 feet for 1 minute.

 At higher levels: you deal 2D4 more damage per spell slot above 3rd level.