What exactly do we know as of 5.3 about the sound that was heard before Amaurot fell?

[Zohar_Lahar]

But I digress. What I consider interesting is something that is generally overlooked and it could be a clue about the nature of the Sound and the Terminus: the DNC quest, specifically the Kriegstanz and the Totentanz. The "dance of the damned" is negative feelings taking hold of people and controlling their bodies, and the Kriegstanz forces those energies out, and curiously, the forms they take are eerily similar to the Terminus monstrosities. Now, the narration of Amaurot mentions a passage of the Book of Revelations that goes more or less like: "But it was neither fang or claw, but our very sins, stacked to the heavens where they took root." The Ancients' society tried actively to get rid of any negative feeling, to foment peace and cooperation, but going by Azem's role, they were not strangers to issues and threats. Perhaps, subconsciously, they "stacked to the heavens" their fears until they burst and caused the Terminus and the Sound, which could be the collective suffering and fear of the Ancients throughout the ages that they cast aside. We would need further insight into the Ancient society, true, but to me that sounds (no pun intended) rather similar to the Totentanz phenomena.

If there was a build-up of negative thoughts that went unexpressed, it might have accumulated in the Lifestream/Underworld until the entire star had a spiritual breakdown. It reminds me of how auspices may sometimes succumb to their aramitama and become feral beings of chaos. Just as how the Mad Auspice Koryu was so utterly consumed by his aramitama to become an apocalyptic beast, the Star was consumed by....something and began the Final Days.