Dancing Fireblade

Summon a fiery blade that idly sticks by the caster until used or dispelled. The caster can then freely choose how the blade spell can be used, (ie ranged or melee, etc.). It is considered a solid when it comes into contact with a physical substance or material, and as a non-physical solid when striking magic (ie; ghosts or spells). This blade alone does fixed 1d4 of fire damage or has 4 hit points per blade that could be used in a defensive manner. Multiple; up to 12, can be consecutively summoned before a long rest is necessary. The number of blades used on a bonus action is up to the caster. When dispelled out of combat, it does not count against the caster. 

3rd Level, Gain an additional 10ft. to the spell's range - 6th Level, Gain an additional 2 spell charges, upping your capacity to 14 - 9th Level, 1d6 of fire damage/hit points instead of 1d4.