Quote Originally Posted by mallleable View Post
Some more kinda wild speculation

While there are sources that state that the 6th calamity was caused by The Elementals who were upset with everyone's misuse of the world's aether, it seem like that info is shaky. So I think we can assume that one of the 5AA super powers, more likely Amdapor developed magicks or a weapon which aspected to water as The Tenth was drowned out that caused the flood. Like how Mhach started augmented their power with The Void, I think Amdapor would utilize another plain of existence: The Aetherial Sea, and their first, and only use of a weaponized Life Stream caused the calamity. And this power is locked away in the Occult Crescent.
So, here's the thing about that: what your first sentence claims is 'shaky' is even shakier than you think!

There aren't current sources that say the Fifth Calamity was caused by the Elementals: the only source for that was the 1.0 White Mage storyline, which was conspicuously the only job storyline that they replaced come A Realm Reborn. Ever since then, the writing has been consistent that the Calamity was essentially caused by the war itself draining the land dry, to such a level that the end result was inevitable; if there was a spark setting off the flood itself, it's always considered far less important than the conditions that led to it in the first place.

What is interesting, though, is that according to the Encyclopedia Eorzea the fact that it was a flood was known, and was unanimously agreed on by every source in every city-state. ...including seers in at least one case, which gives some interesting context to the Oracle phantom job. We also know that the final shot of the war before 'oh crap, flood's coming' was Diabolos hitting Amdapor; I have no idea if that's relevant or what that means, but it feels notable.