Cruel Sun

You create a small sun and fling it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 radiant damage. Hit or miss, the sun then explodes. The target and each creature within 10 feet of it must succeed on a Dexterity saving throw or take 2d6 Fire damage.

Using a Higher-Level Spell Slot. The Radiant damage increases by 1d10, and the Fire damage increases by 2d6 for each spell slot level above 1. The range increase by 10 feet for each spell slot level above 1.