Balerion's Bale Fire Enchantment

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails. On a hit, the target suffers the attack’s normal effects, and a green flame catches the target on fire. This spell’s damage increases when you reach higher levels. On a hit the balefire does 1d4 damage plus the spellcasters modifier. 

At Higher levels add 1d4 per level.