Location: Guinevere, Shrine of the Wind Trial (Ritual room, where you got the mystic arte). Return to this place after you have cleared all the trial
Recommended Level: 60 – 65
Recommended time frame: After clearing all the trials
At the beginning of the battle, kill 2 Wendy ASAP (power link status to Harpy). Once you have killed them, the battle is not that hard. Simply armatize and use your mystic arte.