With your next attack, you can expend one spell slot to deal additional fire damage to the target. The extra damage is 1d8 for each spell slot level. On hit, the target ignites in flames. At the start of each of its turns, the target must make a Fortitude saving throw. On a failed save, it takes 1d8 fire damage. On a successful save, the fire ends. If the target or a creature within 2 meters of it uses an action to put out the flames, or if some other effect douses the flames (such as the target being submerged in water), the spell ends.