Coronal Ejection

A cloud of superheated magnetically charged plasma bursts out from your body. Each creature in a 25-foot cube originating from you must make a Dexterity saving throw. On a failed save, a creature takes 3d10 fire damage and 2d10 radiant damage and is blinded until the end of your next turn. On a successful save, the creature takes half as much damage and isn't blinded.

In addition, the area of effect has all of the effects of an antimagic field until the end of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the size of the cube increases by 10 feet and the fire damage increases by 1d10 for each slot level above 7th.