To tie this all together with some musical cues, the weariness of the soul's endless wandering is something that's been present as a theme in the story at least as far back as Answers. If the question is "Why were we given life just to die?", then Fandaniel's answer would be that there is no reason and that everything should just return to oblivion. And on that note, there is a particular shared intonation during Fandaniel's segment of the Endwalker trailer. Firstly, this rendition peaks with the line "Now we go for freedom!" as Fandaniel ascends the tower, and as I've already laid out I think he is very closely associated with the concept of freedom, and as a character believes that true death equals freedom. However, the second part of this comes at the end of his segment, in which a very specific
sound is heard.
https://youtu.be/XJ-51r-sG4k?t=162
Does that screeching tone before the cut sound familiar to anybody? Well it should, considering it is
precisely the same tone present in the Scions & Sinners rendition of Return to Oblivion, after the very line, "The soul yearns for oblivion, oblivion!".
https://youtu.be/ZTEPqYwvAzw?t=68
I ask you, what are the chances this is a pure coincidence? The exact same piercing sound present in two different songs, both of which are associated with the concept of a neverending doomed fate and the repeating rebirth of the soul?