Wrath of Starfire

You open a gateway to an otherworldly region illuminated by pure starlight. A 20-foot-radius sphere of blinding bright light and searing heat appears, centered on a point with range and lasting for the duration. Dim light shines 30 feet beyond that. Magical darkness can't dispel the light, and creatures fully within the bright light are blinded.

The gateway creates a warp in the fabric of space, and the area is difficult terrain. Any creature that starts its turn in the area takes 2d6 fire damage. Any creature that ends its turn in the area must succeed on a Dexterity saving throw or take 2d6 lightning damage as bolts of electricity descend on them.