Cloak of Corellon

You open a gateway into the starswept, frigid sky high above the plane of Arborea, glowing with the rippling folds of prismatic energy known as “Corellon’s Cloak.” A 20-foot-radius sphere of radiant energy and piercing cold appears, centered on a point with range and lasting for the duration. While active, the light of this zone suppresses any effect of magical darkness, and creatures fully within the area are blinded.

The zone creates a warp in the fabric of space, and the area is difficult terrain. It sheds bright light for 10 feet beyond its perimeter and dim light for an additional 10 feet. Any creature that starts its turn in the area takes 2d6 cold damage. Any creature that ends its turn in the area must succeed on a Constitution saving throw or take 2d6 radiant damage.