Originally Posted by
Absimiliard
Have you done the FFXIV content in NieR Re[in]carnation? It gives a look from just pre-sundering all the way through to the post-sundering world from the perspective of a third-party narrator, albeit one that occasionally tells us what Emet-Selch is thinking or feeling at a moment, or even what he and the other unsundered are seeing. The fact it's coming from the narrator - which I'll note NieR does not make use of the unreliable narrator - and backed up with accompanying by art, another thing NieR always presents at face value, only serves to further reinforce the narrative dissonance. The crossover content in both games is canon.
The scenes in Re[in]carnation tell the story of a people destroyed beyond the ability to even communicate. This is noteworthy because unsundered, like their echo-possessing sundered counterparts, are able to communicate with any living thing that is capable of communication at all. We're also given to understand they were reduced to little more than tattered (and tortured; the JP localization strongly alludes to all of them being in searing agony, though this is curiously absent from the EN version) blobs for a time before they took on their new forms and began rebuilding.