Cyressian's Field of Stars

You conjure a 40-foot cube full of brilliant motes of light which mimic stars at a point within range. The area within the cube is considered to be bright light.

When you cast this spell, you can designate any number of creatures you can see to be unaffected by it. An affected creature cannot turn invisible while inside the area and has disadvantage on Dexterity (Stealth) checks, and when it enters the area for the first time on a turn or starts its turn there, it must make a Wisdom saving throw. On a failed save, the creature takes 4d10 radiant damage. On a successful save, the creature takes half damage.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each spell slot level above 5th.