
Originally Posted by
RyuDragnier
As far as the Ascians knew anyway. Remember, we only know things from their end, not from Azem's memories. We're missing knowledge on what really happened, and that missing knowledge is going to come into play in Endwalker. We may find out that the Sound had formed inside the Underworld itself by the malice of souls unable to accept their own deaths and regrets, and when Zodiark "saved" the world it only managed to calm the being enough by changing out the souls that created it, which would make it so it needed more time to reappear. If so, then Zodiark was indeed not a long term solution, it would only be able to temporarily deal with it, it would still eventually form. If Azem discovered this, then Hydaelyn's Sundering of the world may have been figured out as the long term fix.
It basically not only divided the souls that created The Sound up into 14 parts, it evenly distributed the malice making it less potent. Now since Hydaelyn, and thus Venat and her followers were not Sundered themselves since they died to create Hydaelyn, you have 14 FULLY POWERED Ancients (assuming the tales of "The Twelve", technically 13 because twins, being gods is true), taking on a single part of the Sound themselves, keeping it under control. You have fixed the problem, in a very long term solution.