But only because the faerunian Pantheon decreed that the souls go three first. If they were to abandon the wall, they would also stop drawing all souls to the fugue plane.Thing is you're still ignoring FR canon. Even without the Wall, souls don't go anywhere. You can't get off the Fugue plane on your own. The Wall is not stopping souls. It's a repository not a block. No Wall simply means all Faithless become demon chow.
But only because the faerunian Pantheon decreed that the souls go three first. If they were to abandon the wall, they would also stop drawing all souls to the fugue plane.
Or a character fighting against it would want to bring down the degree that all have to stop at the fugue first too
Like Cynosure, the Fugue Plane exists outside the normal cosmology of Toril. Souls naturally travel from the Material Plane to the Fugue Plane at death, but they cannot leave of their own volition
Where is it stated that the Fugue Plane itself is a construct of the Pantheon and not Ao (who created pretty much everything)?
Well, this is based on the 3.x sources, when WotC tried to pull the multiverse apart.This is from Realms help
The question is: who put the process in place?
If it was the pantheon, or even Ao, it is something with the potential to change.
We know something put it in place, because Toril exists canonically as one of many worlds, and on other worlds (including Aebir!), the souls follow a different path. So at some point, some entity said "It's not going to work that way here."
Why? And who could change it? These are not answered in canon (it seems). But there's nothing stopping it from changing, even if you need to go pun Ao in the face to change it.
Well, this is based on the 3.x sources, when WotC tried to pull the multiverse apart.
Originally the Fugue plane is just an area on the plane of Hades that the faerunian pantheon uses to sort out their souls. So if all souls from Faerun (not even from all of Toril, just from Faerun) go to Hades, regardless of alignment, then it's because someone powerfull decreed that the go there (either the faerunian pantheon or maybe Ao).
Nor in Dragonlance where there is only the heavens and the Abyss.
You're making a division where none exists. Did you read the Erin M. Evans bit I linked to? Other worlds are part of the Forgotten Realms as a setting, including other potential afterlives. The Greyhawk afterlife, the Abeir afterlife, hell even whatever afterlife Earth has - all of these are a part of FR as it is written (since Greyhawk and Abeir and Earth are all part of the writings incorporated into FR).Why? Again, you're applying material to the setting that isn't part of that setting. Sure, we might accept that in other worlds, the dead operate one way, but, again, exceptions exist in most settings.
All of these situations were created by entities who could potentially undo the situation - except maybe Eberron, where no god created the world that the progenitor wyrms shaped (and my understanding of Eberron religion and history indicates that, unlike in FR or DS or DL, the gods come to be created by their worshipers, rather than vice versa). It'd be entirely possible in ANY of those settings to change the fate of the dead.The dead don't go to an alignment plane in Dark Sun. Nor do they in Eberron. Nor in Dragonlance where there is only the heavens and the Abyss. It's hardly like FR is an outlier here.