What purpose did the isle Azys La serve? Main Storyline Spoiler.

[Kaiser-Ace]

Two beasy tribes? Ixal and who?

Some think the Vanu Vanu, I'm saying they FOUND the key to Azys Lla and that they held in to it cause... Heck.

[Huntington]

M. Night twist of twists.

The Allagan people all ascended to become Ascians and escape their corporeal forms.

[Grayve]

M. Night twist of twists.

The Allagan people all ascended to become Ascians and escape their corporeal forms.

Nah, the asceians taught Tiamat how to summon a primal, so they where already around.

[Felis]

Especially after learning it caused the Earthquake that likly took thousands of civilian lives.

it was more millions, not just thousands. It was a worldwide earthquake.

What remained of the technology got maybe destroyed during the ice age (5th umbral era) some thousands years after.

[Kaiser-Ace]

it was more millions, not just thousands. It was a worldwide earthquake.

What remained of the technology got maybe destroyed during the ice age (5th umbral era) some thousands years after.

Alot of the tech in Eorzea its self is still functional independent from the civilization that made it. I will give it that the death toll may have been in the 100s of 1000s to possibly millions thought because you're right, The 4th Umbral Era was one of the few felt across the Planet Hydaelyn.

[Delily]

Some parts of the Lore and MSQ are confusing or not clear to me. The Azys La structure seem monumental and phenomenal. How can a civilization so advanced disappear without a trace. They could remain on Azys La and survive. If Azys La is intact it means the people on it could survive too just like the mobs living there. That place is just weird as it is. It looks so alien ish. That warring triad is a mystery. Are they the source of power that fuels the whole place? If they break free / die or whatever won't make the whole place fall down destroying it? Or it just a huge magical experimental flying lab / Alcatraz of some sort?

They were the cause of their own demise. The short history is that a combination of frustration and existential nihilism prompted Xande to have Dalamud transfer all its stored energy into the Crystal Tower. In theory, this would force open the Voidgate located there and allow the Cloud of Darkness into the world. In reality, this caused a massive, and I mean massive earthquake that brought the empire down and started the Fourth Umbral Era. It's implied the survivors of that event decided to eschew the remains of the empire and drift off. They didn't disappear so much as merely disperse. Their bloodlines are present in the current citizens of Eorzea.

The Warring Triad is the source of power for Azys La. As I said, there were the first primals Xande bound under the guidance of the Ascians. You've completed the MSQ, so you know that primals are massive aether sponges, so by trapping them he's basically created batteries that are draining the aether from the area around them*. If they were released, I'm sure Azys La would fall from the sky and cause massive damage below it (as well as unleash 3 really pissed off primals).

Azys La itself is a bioengineering lab.

* And, conveniently weakening the mother crystal in the process, allowing Zodiark to revive.

[Raxxon]

You know, just because people survived the earthquake doesn't mean any of the survivors knew how to work the technology that was around. How many people these days can't work a simple computer? If most of the scientists and engineers died then how would the normal people know how to operate the more difficult equipment or even repair it if needed?

These people lived without having to do anything at all, everything was provided for them. Do you really think they would have the knowledge to restore their empire? Instead they all likely spread out across the world and joined other groups of people and learned how to survive. Even if some of them could repair and work the technology, they might not want to due to the fact that it annihilated their empire. They might have been against using such dangerous technology and instead wanted to effectively reset the world but having the story of their destruction passed down to keep their descendants from repeating their mistakes (for when they start advancing technologically).

[Fenral]

snip

See, I would believe that if it didn't try so strongly to imply that the original use of the tower, which effectively resulted in a society of people used to having everything provided for them, was right (the final NOAH report outright states this). It effectively disregards the implications that it was the Allagans' over-reliance on technology that unmade them, opting to stick with the "Dalamud bad" explanation instead.

I'm fully aware that some later development could blow this theory out of the water, but there's nothing in-game yet to convince me otherwise.

[Velox]

snip

I think you are mistaking the implication and the point of the story. Technology and knowledge itself is not evil. It's a tool. How you use it is how it is defined. There is nothing wrong with rediscovering what Allag achieved. The point the game has made so far was not that "tech is bad, but do it anyway," but "This is what we built, but we lost sight of what was important. Instead of tech supplementing our lives, we grew dependent. Instead of living on this planet, we attempted domininance. Continue to grow, to learn what we learned, to achieve what we achieved, but now know how we failed so you can spare yourself our fate and surpass us one day."

[RiceisNice]

See, I would believe that if it didn't try so strongly to imply that the original use of the tower, which effectively resulted in a society of people used to having everything provided for them, was right (the final NOAH report outright states this). It effectively disregards the implications that it was the Allagans' over-reliance on technology that unmade them, opting to stick with the "Dalamud bad" explanation instead.

I'm fully aware that some later development could blow this theory out of the water, but there's nothing in-game yet to convince me otherwise.

It wasn't their own allagan technology that did them in (although it was the medium), but rather their own allagan hubris of wanting more power. That led to them channeling al the power collected by Dalamud into the Crystal Tower, causing the massive allagan earthquake that marked the beginning of an umbral era.