So uh I watched Anni 5 when it released and honestly, it confirms just how far Omori is willing to go these days.
To sum it up easily. Apparently's Soul's and reincarnation, do happen and they are likely gonna be important to the Danmachi characters.
I mean it was a possibility since Argo but, the Fianna event REALLY pushes it on a whole new level.
I won't spoil the event but I will talk some spoilers for the characters.
So apparently Fianna is an OP version of Lili. She's so strong that she basically runs through dozens of monsters. There was even a scene where she pretty much killed through 300 Foirmoires on her own. ( Floor 49 Monster from SO1 that the Loki Familia had trouble with as an entire group). Since this is the pre-Dungeon era, surface monster's shouldn't be weakened which means Fianna had to be strong enough to handle hundreds of Deep Floor Monsters on her own without a Falna.
As a side note the other Fianna Knights are also capable of handling multiple monsters on their own, by use of expolosives and other stuff but they are perfectly capable to match modern day adventurers even without using any sort of tricks.
The first reaction I had to this was that, I expected Fianna to have a Spirit or something, because at this point, Spirit hax are becoming more known, and it is confirmed she does have one. However it does not do fight's and has a different role in the story, so it didn't explain her strength. And the other people call her a monster, because of it.
In the end it's revealed she has a special power in her soul called the Bloodfury Spear that manifested due to the influence of the world of despair and her anger towards it. Putting aside the definition, it pretty much works as a Hell Finnegas before Falna existed.
Yeah...This is a thing now. Soul's have so much feelings, that people like Fianna can be OP just for having it. Not even unlocking potential with Falna sort of thing, Fianna just naturally had Hell Finnegas through her soul. Never thought I'd see the day where Bell's RF seemed slow, considering Fianna is basically top tier on the potential of her soul.
Here's where it gets even dumber, Dim(the protagonist of this event) also has this power lying within his soul. And through the stress and pain he goes through the event, he also awakens it and proceeds to stomp the people he's up against when he does. Afterwords, so he asks the Spirit before to transfer Fianna's soul power to him, something the Spirit warns him that he'll never be able to undo and the rage of the Bloodfury Spear would stick within him even after reincarnation. Dim agrees to it nonetheless, and his eyes become red, like when Finn activates Hell Finnegas.
This is basically saying why Finn got Hell Finnegas when he first got his Falna from Loki....
And now I don't even know what Omori plans to do in the current times.
SOUL is now a thing, so I can totally see current cast being past reincarnations of their legendary selves and awakening new powers out of nowhere like Dim and Fianna did. The Falna system might as well be in the garbage now, only thing Omori is planning for the final fights is Level Boosts, Spirit Hax, and now SOUL. I'm seriously dreading what kind of new mechanic the 6th Anni will bring.