You can equip one of these spirits to a fighter to enhance its strength. Your fighter could become very powerful, depending on the spirit you use.
Fight against an enemy fighter controlled by a spirit. Battle all kinds of characters, on all kinds of stages, with all kinds of rules. There are tons of different battle situtations!
If you win the battle, you'll get to test your skill for a chance to collect the spirit.
*Unlocked by playing Adventure Mode.