Looks like all “magical” souls go to their respective plane to reconstitute.
It’s hard to say what makes a mortal soul actually “mortal”. So far it seems to me that it’s a combination of influences of Death magic and time (not sure exactly how time and Order are related, given that all the time stuff in the main timeline could be traced to Aman’Thul alone). Some extra details:
https://www.twitch.tv/videos/619631234?t=0h36m50s
Plus, the connection of the soul and the body sustained by Life.
© http://lorekeeper.net/en/maldraxxus-shadowlands-and-beyond-interview-with-steve-danuser
Given how easy the devs are currently with using ret-cons, anything could be. In the previous backstory curse of flesh was not unique. The same happened of on Draenor because of the effect of Life (maybe spirit?) on the local titan-related creatures.
The target is largely similar, what and how happened is mostly the same. The main difference is that on Draenor it happened directly, but on Azeroth titan-forged were created via the Forge of Wills by “using” the life essence of the slumbering titan. And the curse itself was applied via the Forge of Wills.
Which makes it possible to tie the curse (at least in the way it was used) to the Azeroth’s life essence, that one to the ordered part of her Dream, and that way - to the influence of Life or spirit.
Maybe. Because the current changes in the lore might throw it all out of the window and we’ll have a different info that will negate the former.
In the current iteration of the backstory, the cosmo forces are not really something separate. The devs created a system where they simultaneously fight each other but no1 could be defeated. So, it’s all pointless and there are no stakes in the events, but who cares, I suppose.
In Agthia's Memory
Keeper Mnemis:
It is an eternal tug of war between the cosmic forces of existence.
They constantly vie for power over each other but if one fell, all worlds would fall into chaos.
Another thing to note, there seemingly is no isolated Death overall, it’s a Life-Death system:
Depends, once again, on the iteration of the backstory.
In the former, if the core of the idea would be, say, what is stated in Chronicles, there would be:
In their natural state, the void lords exist outside reality. Only the most powerful of these entities can manifest in the physical universe, and only for limited amounts of time. To maintain their presence in reality, the void lords must consume untold amounts of matter and energy.
Which then would combine well with the supposed actions of the Old Gods:
These malignant entities serve the void lords, and they live only to transform the worlds they infest into places of despair and death.
More “death” = more anima flow. And anima is a potent “energy source”.
In the current iteration of the lore, to get the idea, you would need to get through the broker quests. Tl;dr would be that Oribos is an “engine” at the core of the “machine of Death”, with the Arbiter being its heart (or in its heart); the whole thing is a part of some bigger design created by the 1st Ones.
So the Void / Shadow might be after other parts of the “grand design” and the Shadowlands might be a gateway to it. In this scenario the flow of souls is a “tether” or a road to get a foothold in the plane formerly placed behind some kind of veil™.
The Shadowlands could’ve been a great source "tool to move forward many dropped plot lines of the past and build up new elements in the story. Just Eonian Archives to me looks like a source of many opportunities.
Instead, Shadowlands barely makes use of the familiar stories and characters, and when it does, it’s frequently either as a plot device, or for the ret-con purposes.
I mean, the expansion is not over so far. Maybe? Do not get hopes high, and then there might be fewer disappointments.
gl hf
