I agree with Ramza and Ira. Not just because it's the ethical thing to do, mind you. Unless someone has been withholding information, we don't have a way to outright destroy such a gigantic mass of souls.

Not to mention, allowing them into Crystallis' normal cycle of souls could solve the issue of revitalizing the First Crystal... at least, if we can ensure they won't just devour it in the process. [He turns to the NPCs.] I'd like input from our Avatars in regards to this.

[Duster's idea makes him pause, then nod.] There might be something to that. The core of the Soul Divider is shaped like a harp. That's no coincidence, I'm sure.