Aethel's Necrotic Flames

A flame that consumes the light around it erupts from the point your eyes focus at. Each creature in a 40-foot-diameter cone centered on that point must make a Dexterity saving throw. A target takes 6d6 necrotic damage on a failed save, or half as much damage on a successful one. On a failed save the flames cling to the target's flesh and continue to burn away at them, at the start of their turn they take 1d6 necrotic damage and can make a Dexterity saving throw to end the effect. A creature that ends it's turn prone will end this effect. (Stop, drop, and roll).

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 necrotic damage increases by 1d6 for each slot level above 3rd. At 5th level the burn damage increases to 2d6 and at 7th level to 3d6.