Questions/Theories About Coil (Long Read SPOILERS)

[Skyhound]

I'm so glad we're talking about boulder downs. I was looking around there and comparing the Crystal formations with others found in Eorzea.

Four things stuck out to me: the Crystal formation envelops the allagan structure almost like a dome, this domed formation also seems like it was layered in some way, the Crystal is extremely dull which leads me to believe that it has been there for a very long time, AND the giants are there.

I don't believe boulder downs has any thing to do with Dalamud aside from having allagan origins. I believe it's another instance of them trying to keep something hidden away, but was eventually found.

People have speculated that Acheron is actually a giant and another person has speculated that the Crystal Tower is a prison. Acheron's chamber(cell) is called the Hall of the Inexorable, which means something that cannot be stopped, persuaded, or altered. This leads me to believe that Acheron was actually the leader of a Giant rebellion. Perhaps Acheron was chosen to guard CT as punishment while his comrades were imprisoned in boulder downs?