Explicación del final por parte de SE
Seeking control over this realm and its abundant crystal resources, the Garlean Empire (a scientifically advanced nation hailing from the north) begins gathering an army of epic proportions. To ready themselves for the coming conflict, the city-states of Eorzea reinstate the Grand Companies─comprehensive centers of command which combine the commonwealths’ military and economic assets. However, the commander of the invading forces, VIIth Imperial Legion Legatus Nael van Darnus (a.k.a. “White Raven”), has plans of his own. Driven by madness, he silently plots to usher in a more permanent form of devastation: Meteor.
The Meteor project is comprised of a complex scheme employing arcane magicks and lost technology to summon the lesser moon down to Eorzea in an attempt to annihilate the realm’s inhabitants in one fell stroke. Dalamud, as the celestial object is commonly known, is revealed to be a colossal machine launched thousands of years ago into the planet’s orbit by an ancient civilization.
Realizing the futility of standing alone against such a threat, the Grand Companies put aside deep-rooted differences and consolidate their forces under the banner of the Eorzean Alliance.
At the behest of this new confederation, adventurers from across the realm take up arms and march on the floating islands of Rivenroad. Here, the brave heroes confront Nael van Darnus, and after a heated battle, put him to the sword. But by this time, the White Raven’s plan is too far along, and Dalamud continues its descent.
In an eleventh-hour bid to save mankind, the Grand Companies turn to Louisoix, an enigmatic scholar hailing from the forgotten city-state of Sharlayan. The ‘Archon,’ as he is called, devises a plan to summon the power of the Twelve, Eorzea’s pantheon of guardian deities, and use that power to banish Dalamud back to the heavens. But for this to succeed, the rite needs to be performed directly beneath the point of Dalamud’s impact. After several sleepless nights of deliberation by the realm’s foremost arcanists and astronomers, that point is determined to be a vast swathe of barren lowlands in central Eorzea known as the Carteneau Flats. With this information in hand, the Grand Companies order the immediate mobilization of their forces.
Unbeknownst to the Alliance, the soldiers of the VIIth Imperial Legion, oblivious to their leader’s dark intentions, have also begun gathering in central Eorzea. Ordered to defend the area with their lives, they prepare for a fight, unaware that victory will bring about their own demise.
And so, with two great hosts amassed, the Battle of Carteneau begins.
Both sides fight with a desperation-fueled frenzy, neither yielding the other ground, until from the skies, a great roar issues. Dalamud has begun its final metamorphosis. In a matter of moments, the stone and metal of the moon’s crust crumble away to reveal none other than the elder primal, Bahamut, now free from his ancient prison.
And thus do the people of Eorzea learn what it is that truly faces them. Never was it the White Raven’s intention to blight the realm with Dalamud, but what slumbered within it.
Enraged after aeons of duress, Bahamut unleashes his wrath upon the realm, spewing forth endless fire and destruction. Louisoix quickly conjures a barrier to protect what remains of the Eorzean Alliance, and then begins the arcane rite that will channel the power of the Twelve and focus it into rebinding Bahamut. The sheer force of the primal, however, is too strong for even the Archon, and his efforts fail.
Realizing the end is nigh, Louisoix summons the last of his strength to call upon Althyk, the Keeper, god of space and time, to send those surviving heroes into an aetherial rift, where they are to remain untouched by the passing of the seasons until it is once again safe to emerge…and continue their struggle to forge Eorzea’s future.