Quote Originally Posted by Veloran View Post
The Final Days encapsulates the entire end of the world, he doesn't specifically say they're at fault for the Sound but the Ancients are absolutely at fault for the Sundering.
I don't think it was meant as "they caused the sound". It seems more likely that such an advanced people wouldn't think a sound worth anything of significance, and in their hubris ignored it until it got out of hand. These were people who mostly let nature take it's natural course, as evident by one of the side stories; they probably didn't think a "minor" sound worth much thought.