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You (Probably)
Wow, does Ivalice really need another thread?
...Maybe? We could use one inherently accepting Ivalice as separate from (but a reproduction of) Final Fantasy T[actics|welve] and meant to focus on the entire raid structure in a centralized thread, but, hey, I'm the OP. I'm biased.
Let's get this out of the way, though:
The world of Final Fantasy XIV remains isolated.
Return to Ivalice contains no bridge (cosmological, interdimensional, void...u...lar, or chronological) to the world of Ivalice.
(Or any of the other games, for that matter. Claims to the contrary—pseudocanon funtime crossovers aside—remain unconfirmed fanon in direct contradiction of Yoshida-san's previous comments and established themes with the Crystal Tower, the Warring Triad, Omega, and so on.)

Originally Posted by
Kazutoyo Maehiro (Main Scenario Writer; 2.0, 3.0)
To be absolutely clear, there is no direct connection between FFXIV’s Hydaelyn and FFXII’s Ivalice or even FFXI’s Vana’diel. They are not the same world in different dimensions or time—they are their own separate worlds. However, there are certain connections to people or objects that appear in these other worlds that figure into the story of FFXIV as it has been conceived and is being told.

Originally Posted by
Naoki Yoshida
My stance, personally, has not changed. And so with that being said, if you play through the content of Return to Ivalice and see what the interpretation of it is, within that content, this is something that we discussed in-depth with the creator of Ivalice, Mr. Matsuno, and this is content that won’t end with just one patch. So we’re hoping that players can dive into the content and see how we’ve interpreted Ivalice and sort of brought a new sort of interpretation together.
@YasumiMatsuno 2017/10/11
誤情報を拡散されると困るので記しておく。
It is troublesome to dispel misinformation, so I will write this down:
「FFTのその後のストーリー」じゃないよ!
It is not a "story that takes place after Final Fantasy Tactics"!
14時間生放送で語ったとおり、FF14というテーマパーク内にイヴァリースをもってきたらというコンセプト! 続編でもなんでもない!
As I said during the 14-Hour Broadcast, our concept is bringing an Ivalice attraction into the theme park we call Final Fantasy XIV. IT'S NOT A SEQUEL!
バーロー!w
Ya dolts! LOL
#FF14 #リターントゥイヴァリース
#FF14 #ReturnToIvalice
That said: When ever XIV has engaged in a cross-over, it has blamed the other world for its intrusion. Hydaelyn is isolated; Shantotto got here because XI's cosmology allowed it. Hydaelyn is isolated; Lightning got here because Bhunivelze allowed it. At Paris Games Week 2017, Yoshida-san joked that whether any real connection to Ivalice exists and would override this previous tendency is thus entirely in the hands of Matsuno himself.

Originally Posted by
Naoki Yoshida
The answer to that is for Ivalice’s creator, Matsuno-san. He’s kind of like a god to me, so let’s just say “only God knows.”
RAID SYNOPSIS
BACKGROUND
Unbeknownst to most outside of the Garlean Empire's reach, the late Emperor Solus zos Galvus had a deep appreciation for the arts and gave generously to many theater troupes. So was it that the Majestic Imperial Theater Company—widely regarded as the finest practitioners of the dramatic arts on the Three Great Continents—was sponsored in the construction of a massive theater barge known as the Prima Vista, that they might travel as they would for inspiration and performance.
By contrast, Varis has shown little of the same love for creative license in his brief time on his grandfather's throne. All artistic works must now pass the central imperial board of censors; all works deemed offensive will cause their troupes to lose their writs of transit (or simply vanish altogether). Principal Jenomis cen Lexentale—leader of the Majestic players—sought to circumvent this ultimatum of sacrificing integrity to curry the Emperor's favor or ceasing the arts altogether by embedding anti-policy messages within seemingly-apolitical works.
The Zodiac Brave Story became one such tale. Rooted in a fairy tale known throughout the Empire about a commoner named Delita who would rise and establish the mythical kingdom of Ivalice, the play was by all appearances yet another retelling of a myth so enthralling as inspire borderline worship; to most it would seem the troupe was merely cashing in on an easy payday. Yet Jenomis had slipped subtle messages contrary to Varis's rule past the censors and onto the more learned members of the public. In retaliation, the censors targeted the troupe's patrons rather than publicly admitting incompetence, bleeding their funding to a trickle.
All but driven from the Garlean Empire, however, Jenomis burrowed deeper in his life's greatest passion. Even as far back as his days at the Magitek Academy, the man was obsessed with Ivalician lore and refused to believe it mere myth. Over the years, he had become convinced that the Zodiac Brave Story was but half the tale. He believed that Delita had an ally forgotten by history—his closest friend—with whom he had parted ways due to the death of his sister, Tietra. Hoping to find the truth and pen the lost complement to the Zodiac Brave Story, Jenomis had followed tales of Ivalice to Othard, beyond Nagxia and into the lands of the Kindgom of Dalmasca, which had thrived for untold generations before the Empire's arrival sixty years past.
Jenomis had returned from the Dalmascan deserts with artifacts in the past, including a strange crystal called "auracite" that he claimed would speak to him. It was assumed he meant this figuratively, but during a respite in Hingashi, he was clearly heard conversing with what he believed to be his late wife...and whatever it was had answered. Shortly after that, Jenomis had vanished. His son—Ramza bas Lexentale—believed that his father had returned to excavations beneath Dalmasca's captal, the Royal City of Rabanastre, looking for the lost capital of Ivalice, but a rescue mission into the so-called Desert Sapphire had gone horribly wrong. Returning to Hingashi, he found that his sister Alma, with the help of Jenomis's old academy friend Cid Garlond, had secured the help of a famous adventurer for a second attempt at Jenomis's rescue...
THE ROYAL CITY OF RABANASTRE
INTERMISSION 1
AURACITE & LUCAVI
COMPARISON TO IVALICE PRIME