Devil has challenged you into a duel. Now that you have Rank 10 Keyblade Master Reputation, you need to farm for some Tokens to get the Class itself. Go and fight the Devil in this map until you get the drops that you're being asked out for.
You did it, the Devil has been slain. Now, take this Token of your hard work and continue your hard work even farther to get better rewards. Thank you.
Legacy of Nulgath Unknown , Rank 10 