Truth Seeker Devianne:
All right, go to Beleth's Magic Circle now. Take down as many monsters as you can, and the Circle will become unstable.
When the magic Circle turns yellow, kill off the nearby Decay Hannibals, Armor Beasts, Klein Soldiers, Disorder Warriors, Disorder Avatars, Blow Archers, Bizuards, Mutated Flys, Amos Soldiers, Amos Officers, Amos Master, and Ailith Hunters. Then you'll be able to rescue those who haven't completely mutated yet!