(Spoiler) About amaurots downfall

[Eyvind]

I also doubt Hydaelyn was the sound or soundmaker, but with tinfoil hat attached we are looking for something that...

...is small enough to have required time to travel (it went from "across the pond" to Amaurot

...ended its days in Amaurot, which is close to Limsa

...would be a creature Zodiark contained...and the universal sign in fantasy that something is "contained but still a threat" is that it is turned to stone or encased in stone

...exists in both the Source and the Shard, split like anything else

...in the true manner of a Chekhov's gun, both repeatedly drawn attention to and made inconspicuous (say a part of the landscape important as a seat of government in two worlds, or the site of a recent story that mentions how far down it goes under the surface)

Funny how the main spike of stone in Limsa and Eulmore is the only obvious feature to survive on both worlds, and funny how it looks more like a horn than a natural rock formation.

Also with Hydaelyn weakened and Zodiark trapped, any contained creature would have little trouble breaking free, I bet, with enough rejoinings.

< /tinfoil hat>