
Originally Posted by
HeroLogarin
Here's the question: was Bahamut resealed away and thats where the coil raids come in?
As Belhi laid out, not quite. To zoom in on one thread of that tale: (Binding Coil spoilers.)
In 1.0, Louisoix sent a great number of people on a pilgrimage to pray to the Twelve to save them from Dalamud and the Empire. (He carved the symbols of the Twelve into the random stones you can still find littered throughout Eorzea.)
He planned to cast a summoning spell to use the strength of the Twelve to send Dalamud back into the heavens, but Bahamut broke out of it. The free-floating aether from the failed spell, as Belhi said, combined with uncountable prayers focused on Louisoix and turned him into a primal. He punched through Bahamut and assumed he killed him, so he was going to return all of the aether to the land so it could be reborn (his sentiments of "rebirth from the ashes" are probably why, as a primal, he took on attributes of the phoenix, an image that was probably salient in his mind).
The key point here is that Louisoix was wrong. Bahamut's core, a heart of crystal, had not been emptied or broken; he still had an anchor to the corporeal world. Bahamut tried to re-absorb as much aether as he could, including that of Louisoix, which is why the land recovered so quickly but the job looks half-finished and kind of warped.
Those big sword looking things (internment hulks) that fell out of Dalamud were holding Bahamut in place. Most were disabled in the fall, but four still functioned to some degree. Those four hulks sought out Bahamut's heart to do their job - binding and restoring him to keep him in healthy stasis.
That's why Bahamut is bound in the Coils.

Originally Posted by
HeroLogarin
there's a scene with your respective scion when you start the game, when the echo first occurs for your character, but Dalamud is in the sky <...> when does the scene take place in the timeline?
The Echo you see after fighting the Golem actually his little to do with any of that. It's the second time you're meeting your Scions, and the Echo resonates with them and gives you a bunch of random, rapid-fire flashes of their journey prior to that - they're not even in the same year.
Full Explanation of Scenes in the Echo
SCENE 1
It's 1562 (15 years ago). Louisoix (a Sharlayan) has interpreted the Divine Chronicles of Mezaya Thousand-eyes (a prophecy) to divine that the Seventh Umbral Calamity will put an end to the Sixth Astral Era. It's been 5 years since the Garlean Empire took Ala Mhigo and they have now fortified their foothold in the realm to the point that they can begin their war for the Eastern theatre in earnest. He fears that this war will give rise to the Calamity.
Negotiations between Sharlayan and the Empire are falling through, and the Sharlayans are engaged in a mass-exodus back to the motherland (a northern island) from the Eorzean colony (in the Dravanian Hinterlands). Louisoix is defying their orders and their way of life by interfering in other nation's affairs rather than observing history take its course. He has gathered twelve of his disciples and is scattering them across Eorzea to determine whether the city-states plan to make war on Garlemald or not and, however the Calamity is to come, forestall it.
This first flash is his disciple in their assigned city-state, having the sudden realization that it's not just the Empire that puts Eorzea at risk of Calamity. Somehow, the beast tribes have learned to summon primals - great aetherial demigods that have historically appeared in the twilight of an Astral Era. (Disguised Ascians taught them, tricking them into think they were doing the right thing by summoning them to protect themselves.)
BETWEEN SCENES 1 and 2
The Battle of Silvertear Skies (fall of Midgardsormr into Silvertear lake, the destruction of Mor Dhona) takes place while the Scions are investigating the coming Calamity, and soon after the primals indeed begin to appear (a feat facilitated by the broken seal on the lake's aetherial confluence). However, those blessed with the Echo also appear, another phenomenon that the histories say occurs on the cusp of Calamity.
The Empire, having dealt with primals in their conquest of Othard, knows that they are extremely costly to fight and will only be resummoned if defeated. They retreat to Ala Mhigo and for ten years do nothing, as they have no plan. Eorzea settles into a deceptive calm, giving Louisoix's circle time to study and try to get the realm prepared to fight.
In 1572, Nael van Darnus (whose true identity is complicated and explored in the Coils) promises the Emperor that he will restore ancient, lost Meteor magicks by way of technology, bringing Dalamud down upon Eorzea and annihilating it. Gaius van Baelsar disagrees with this, but is placed under Nael's command and ordered to supplement him (having "failed" Silvertear and accomplished nothing for ten years). The VIIth and XIVth Imperial Legions invade Eorzea, Dalamud begins to fall...
SCENE 2
It's 1572 (5 years ago). Dalamud's fall is wreaking havoc on the aetherial rivers that flow under Eorzea. Louisoix's fears were well-founded, and they're hoping that it didn't take them too long to convince the city-states to resurrect the Grand Companies. There's nothing left to do but put faith in Louisoix's plan for the Battle of Cartenau.
SCENE 3
It's about 10 minutes before you first meet the Scions in the first quest. There have been reports that a mysterious stranger (really an Ascian) has been stirring up trouble in the area, usually accompanied by some kind of aetheric disturbance (Ascian void-warping, Darkness magicks, voidsent summoning, who knows. ODDITIES.) This mysterious stranger keeps getting away, but they're ever in pursuit. This is how they came upon you in the first place and how things have changed since 1.0.
Fun Fact for Ul'dahns
With the 1562 scene, you're actually seeing a moemnt that was in 1.0 from a different angle. Remember the parade, where Thancred walked by in the background with a woman in each arm asking "And where are you two lovely ladies staying?" before the Goobbue broke loose? Same moment, different perspective.