... am... am I gonna miss Nathanos?pic.twitter.com/aoMwEIaN3J
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Do we know this for sure? I interpreted the fading away forever bit as a sign that the Maw is SO impenetrable, that every soul placed in there is as good as gone. I don't know if I've seen any sign that souls in the Maw fade away rather than get tormented and imprisoned forever.
There are a multitude of fates that happen to a Soul when it goes to the Maw. Bear in mind this was supposed to be the place for the irredeemable not who is going there currently. So your soul either gets grind into a weapon, fellow soldier, or into literal dust.