Black Flame Ritual

You summon a lingering ring of black flame that encircle you in a 15-foot radius and 10 feet high that lasts until the end of your next turn. Each creature who is caught, enters, or starts their turn the radius must make a Constitution Saving Throw. A target takes 2d6 Fire damage and 2d6 Necrotic damage and cannot have its Hit Points restored until the end of its next turn. On a successful save, it takes half as much damage but still suffers the additional effects. Constructs automatically succeed and take no additional effects.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damages increase by 1d6 for each slot level above 4th.