Eldritch Inferno

You unleash a torrent of eldritch flames in a 60-foot cone. Each creature in the area must make a Dexterity (DC 15) saving throw. On a failed save, a creature takes 5d6 fire damage and 2d6 necrotic damage, or half as much damage on a successful save.

In addition, the flames linger on the ground for 1 minute, creating an area of difficult terrain. Any creature that ends its turn in the area takes 2d6 fire damage and 1d6 necrotic damage.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the fire damage and necrotic damage increase by 1d6 for each level above 5th. The damage from lingering flames increases by 1d6 and 1d6, respectively, for each level above 5th.