Black-Flame Blade (Updated)

The range is Self (5-foot radius).

You brandish the weapon used in the spell's casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target takes an extra 8d6 fire damage or half as much extra fire damage on a miss. Regardless of whether you hit or not, you can cause a 5-feet wide 60 feet long line of black flame to shoot forward from the target. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 fire damage on a failed save, or half as much damage on a successful one. The target is not affected by the line of black flame.

The black fire ignites flammable objects in the area that aren't being worn or carried and cannot be extinguished by normal means.

When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.