#mindblown and I KNEW they'd posted Siren concept art, thanks for linking that. <3

And- ahaha. I didn't say Midgardsormr was -intentionally- protecting Eorzea from the other Primals, just that it was, y'know... kind of happening as a side effect. :3 My theories prior to now involved the Primals being trapped in the Garlean airship or something, but the battle at Silvertear having a side effect of popping a hole into the Void open makes a lot more sense.

And, yes, I've been thinking for a while that Louisoix knows a lot that we don't - he HAD to have known that defeating the Primals would send their energy up into Dalamud. I am not sure how to reconcile that with the apparent fact that he wants the people of Eorzea to live and survive the conflict. I have a lot of hypotheses, but none that I feel terribly confident stating outright because there's not a lot of facts to support any of them.

Maybe it wasn't the entity within Dalamud that was sucking up the aether, but rather, Dalamud itself? Louisoix would have a reason to strengthen the Allagan prison - to buy time to do whatever deep magic from beyond the dawn of time he's cooking up - and this allows the entity within Dalamud to still be our enemy, as implied by its apparent possession of Nael van Darnus, and Nael's obsession with the Void.

It's also possible that the entity within Dalamud just wants to be free and was able to use Nael because his mind was already broken and cracked by madness, but... I'm not sure.

Edit: Or Louisoix could be Evil All Along but I don't feel that that's plausible.