I tried to find other solutions to this problem. And…
The most straightforward answer had been time manipulation.
Using [The Hermit] to control time and travel to the past to retrieve their souls would have been the most optimal solution, but even that didn't work.
It turns out I couldn't retrieve souls that had ceased to exist, even in the past.
The Root served as a connection to all of space and time within the Nether Realm, and the Nether was the custodian of the souls that existed there.
The souls that were with him, and the souls that were meant to return to him—all of them were gone for good.
I tried using [The Hermit]'s Time Magic, and [The Moon]'s power to travel back in time and duplicate the Souls of those dead in the present, but not even that had worked.
The moment I brought those souls to the present, they dissipated.
It was so frustrating.
I tried several other options, but nothing I could think of worked.