(Spoilers)The rejoining kinda useless.

[Rannie]

Keep reading. The tale you're reading is his conversation with Hythlodaeus. Which both were suited for office due to their rather unique ability to read the color of souls. Apparently Hythlo was better at it.



Hythlo had an issue that was apparently happening BEFORE the Final Days where a pheonix or bird was created - which gave you the entry you're reading now.

I have a suspicion that souls joining creation magic may have been the either (and) catalyst for (summoning) Primals/Final Days (may have to do with the sound) idea of summoning a primal to save themselves from it since primals can have "pilots"




Because in this case they're talking about their lifespans which are biologically immortal. This is later addressed when Emet in the tales - loses his son to illness when he's in the Garlean Empire.

I have read the whole thing. That incident in which you were speaking of was not due to them imbuing an artificial life with a soul

Hythlodaeus stretched out a hand to the enormous gate that stood before them. Soundlessly, the towering doors swung open...and Hades found himself wincing at the ear-rending cry that emanated from within. Furrowing his brow, he stepped across the threshold to be greeted with the sight of a magnificent bird, its plumes fairly afire, circling high in the vaulted hall. Having marked the creature's undeniable beauty, it took him but another moment to identify the problem─an unmistakable light shining in its heart. His breath caught in his throat.

"A*soul... How?"

Through their mastery of creation magicks, men could weave anything into existence. Anything they could imagine, they could bring forth─anything, that is, except a soul. As Hades well knew, souls spontaneously manifested within creatures that were born in accordance with the laws of nature. It was a gift from the star itself, long held to be impossible to recreate. No artificial being, no matter how subtly sculpted in the image of nature, could come to possess a soul. Such creations occupied a separate classification known as arcane entities.

"There was an accident," Hythlodaeus began. "During the concept's examination, a drifting soul merged with it─a soul burdened with regret, judging by the being's behavior. It rages against the pull of the Underworld."

It was due to a drifting soul merging of it's own accord as an accident there is still no proof that they themselves could do it or could not do it. And still the only artificial life that we know of that had a new born soul blossom into it was Alpha. Which was after the summoning. Plus it also goes on where Emet does something to the bird but it never says exactly what happened. He drew on the power if the underworld then he was woken up.