Cruel Sunrise

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 50-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d12 radiant damage on a failed save, or half as much damage on a successful one. A friendly creatur. Within range can add energy to this spell by taking disadvantage on all attacks and checks for 1 turn this adds 1d12 per creature and add 25 feet to the sphere

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 and 1d8 per  friendly creature for each slot level above 5th.