They haven't told us for one of two reasons. First, because it's not time for us to know yet narratively. Or two, because they themselves don't really know, which is why they had to will a god into existence to brute-force an end to the problem.Furthermore, I'm having a really hard time tracking the support this thread and others give to those Ascians who have absent mindedly neglected to tell us what actually caused the sound, because those guys are liars. They don't want us to know because they caused it.
I don't really see how benevolence and submission to fate are traits that are supposed to go hand-in-hand. To your earlier point the Ascians view sharded life as lesser beings because they quite literally are lesser broken forms of their prior existence, and that through the rejoining they're in fact saving everyone and returning them to what they once were.They weren't the benevolent civilization that they have projected to us, because it they were so great how did they make the leap from superior enlightenment to we're gonna cannibalize 13 worlds and the source to bring it all back? A superior benevolent society knows their time is up and doesn't claw it back from the brink of nothingness.
Emet seemed to believe that Mitron and Loghrif were dead. Even if they were aware that Mitron had in fact become Eden, it's debatable as to whether it would have either been possible, or desirable in terms of their plans, to try restoring him.The Eden story even highlighted this: Emet-Selch (or Elidibus, were he so inclined) could have stopped the Flood of Light, if he had saved Mitron early on by de-Edenifying him. Instead, the Ascians just shrugged and went "meh, we can raise another shard of Mitron, forget about that one".
This is probably not accurate? Elidibus' drive seems to be a trait of his character far moreso than his mantling of the WoL primal. It's not like Ysayle was driven by Shiva's will.He was a primal and everything we know of primals shows they are of one mind and one drive.