Arietta is one of the Six God-Generals and a timid girl who was raised by ligers after losing her parents to the Hod war. 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, and also since Arietta had been originally Ion's Fon Master Guardian.

Source:Wikipedia