Cosmic Comet

You harvest cosmic energy in your hand to create a ball of sparking purple and golden energy and fling it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d12 force damage. Hit or miss, the ball of energy then explodes. The target and each creature within 5 feet of it must succeed on a Dexterity saving throw or take 1d6 radiant damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the radiant damage increases by 1d6 for each slot level above 1st.