Spark was more than enough to contend against a mythical opponent on its own. With its eight blades, it gave the opponents a run for their money when they engaged it in melee.
When they kept a distance, Spark's three pairs of wing-blades detached from its back. These six long blades then split into eighteen shorter blades. These blades flew around as if drones. They struck the enemies with incredible speed. All the while, Spark continued to fight using its two main arm-blades and occasionally, its leg-blades.
The spirit weapon no longer had a distinctive melee and ranged mode. It could perform both at the same time.
Spark also had a very high intelligence. It was able to study its opponent's fighting pattern and adjust accordingly. Jack didn't have to trouble himself by giving it instructions. Quite the opposite, Spark informed Jack about the enemies' weaknesses it had uncovered.