One of the Six God-Generals, Arietta is a timid girl who was raised by ligers after losing her parents to a tidal wave. She controls monsters and animals which aid her in battle and wishes to kill Luke's party for killing the liger queen that raised her. She resents Anise for supposedly taking away Ion (whom she was in love with), since Arietta had been the original Ion's Fon Master Guardian.
In reality, the Ion that accompanies the party is one of many replicas of the original. Arietta was not aware of this, nor of the fact that she was removed as Fon Master Guardian to keep the replica's identity secret, and Largo suggests that she would have committed suicide if she had learned of what had happened to the original Ion. Having nowhere to go, Arietta joined Van's six God-Generals. Van also turned the slowly sinking Isle of Feres into Arietta's secret private boat, which also once served as Van's headquarters. Following Ion's death, Arietta blamed Anise (although Anise was partly responsible, as she had been forced into betraying Ion by Grand Maestro Mohs) and challenged her (and the party) to a duel to the death, which she lost. Tragically, Arietta died without realizing the Ion she sought after so much was not the one she loved.