Burning Blade

You brandish the weapon used in the spell's casting with flame and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack's normal effects and then must succeed on a Dexterity saving throw or be coated in flame and takes your spell modifier of fire damage. at the start of your next turn. The target takes your spell modifier of fire damage, and the spell ends.

This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d6 fire damage to the target on a hit, and the damage the target takes from flame increases to 1d6. Both damage rolls increase by 1d6 at 11th level (2d6 and 2d6) and again at 17th level (3d6 and 3d6).