
Originally Posted by
Viridiana
Are we adventurers acting in service to Hydaelyn? Is the Echo her gift to us? Are the Crystals of Light an expression of her "blessing" upon us? What exactly is our interaction with the Crystals of Light?
As far as we know? Yes, yes, maybe, and unknown. The Crystals of Light weren't all simply hidden away to be found, we flat out made some (for instance, when Hydaelyn's power ripped the aetheric mist from Garuda and consolidated it into the Wind Crystal).
My theory is that we're going full on Final Fantasy Classic. This could mean that Hydaelyn is the Crystal of Light, Zodiark is the Crystal of Darkness, we are the Warriors of Light, the Ascians are the Warriors of Darkness, and this entire Astral/Umbral cycle is the frequent upsetting of the balance between the worlds of Light and Darkness and the conflicts that arise from it.
But even if that theory is wrong, it is still likely that we are dealing with longstanding Japanese alchemy and elemental philosophy. The prime elements are the composition of the world, so where Hydaelyn is "all made one," her life is sustained by the six elements (usually Four + Void in Japanese mythology). Therefore, if you darken the "heart" of the six elements, you darken Hydaelyn. To me, this is what the Crystals of Light seem to represent - the pure essence of the aspects from which our realm is comprised. I think that, when the time was right, Hydaelyn consolidated this pure essence into the Crystals of Light and left them in our keeping so that we may safeguard them as they empower us.
If you pay really close attention in the Praetorium, several times, before we're given extraordinary powers that make the fights easier, we glow and for a moment the crystals of light appear around us and swirl. Look for it the next time you engage Lahabrea - because this is why the fight is a joke: it's not only Hydaelyn's blessing that protects us, the pure essence of every elemental aspect of light is at our command.

Originally Posted by
Viridiana
What I think is interesting is that our absorption of the Crystal of Light (more on this later) seems to come *before* our interaction with Hydaelyn. In fact, the "Echo scene" showing the starfall doesn't occur until the Crystal has been absorbed, either.
When you come across the first Crystal of Light, I think Hydaelyn is just popping back in to say, "You're doing exactly as I'd hoped. You'll need five more, keep going." Remember, this is actually our second interaction with her in ARR. If you are a new adventurer first created in A Realm Reborn, you are chosen by Hyadelyn exactly as you were in Version 1.0: as you come to Eorzea. You're almost to the city, dozing off, BOOM, "Hear... Feel... Think..." That is the moment you are chosen, when the Echo is bestowed upon you. If you were in 1.0, but didn't finish the Seventh Umbral Era storyline, it's pretty much the same thing - except that you were already chosen, you just didn't know by whom. The Echo was very mysterious and who we were chosen by was never known. Therefore this would serve as Hydaelyn's introduction of herself to you. This is also the case with those who are exiting the Aetherial Rift into which they were cast by Louisoix - they had the power, but now is the first time she reveals herself.

Originally Posted by
Viridiana
What if there's really no way to reconcile our existence with the plans of the Ascians?
I don't know if he means our existence (as a person), but the abstract existence of Hydaelyn's Champions, the Godless Blessed in general. The plan of the Ascians seems to be to burn Hydaelyn out of existence entirely, perhaps to end this Astral / Umbral cycle of imbalance by destroying what they see to be the source of it. If the dark, purple crystal we saw a brief glimpse of was indeed Zodiark, then Hydaelyn would of course be seen as the source of imbalance. The champion of light, in possession of the crystals of light, would be a very big threat to those who would see darkness rise. Square Enix has done a pretty decent job of making THE PLAYER "the chosen one" without making it overly absurd that everyone in the game is "the chosen one." I think by now it's very clear that the champion is to what Louisoix referred when he mentioned Daybreak, the blade of light. They are The Champion's allies, these godless blessed, but they are mere Warriors of Light.
This also answers your question about Godless Blessed, as Hydaelyn's power, enhanced by the possession of the Crystals of Light, does indeed cause us to glow at various points in the story as we exhibit powers we wouldn't normally have.

Originally Posted by
Viridiana
I half-suspect that the Echo really is just a weird anomaly in the aether, and that Hydaelyn, by choice or limitation, only speaks to those who have it already. Someone who paid more attention than I during 1.0 would have to clarify one point: is there any indication that Echo bearers other than the PC were ever directly contacted by Hydaelyn, or are we presumably unique in this regard?
There's not much to express as rigid proof - just a ton of implications. All of Version 1.0 was about awakening to The Echo and trying to figure out who did it. All of A Realm Reborn has been about who did it but why. The transition between the two seems to just answer the question with, Yes, Hydaelyn did it. That they call it an "anomaly in the aether" is indeed strange, but it doesn't necessarily mean that Hydaelyn isn't the source. If she were bestowing a power on people that allowed them to view the past in a way that leads them to a future that benefits her and also gives them an edge in combat against the forces of what might be the World of Darkness, that would be an extreme overstepping of her bounds. If the point of all this is balance, she just tipped the scales in her own favor. That might be what they mean by anomaly, that she has no right to do so. They imply that it was our side who is acted inappropriately. It could go a lot of directions, including in the direction of your suspicions.

Originally Posted by
Viridiana
Apparently it's this strength itself that draws in the light we use to defeat the Ascians later. That is to say, it's the strength that gives us light, not the light that gives us strength.
Without this assumption, the rest of your theory becomes a bit of a house of cards.
Have you ever heard of a feedback loop? Sometimes balance is so fragile that any disturbance of it causes a reaction that just cannot be stopped. Temperature rises, ice melts, the missing ice no longer reflects light, heat is absorbed by the water, the temperature rises further, more ice melts, etc. etc. I think this type of causal loop is to what the Ascian refers. Hydaelyn bestowed upon us her blessing, this blessing gives us strength, the power of light is drawn to it, we get stronger, drawing more power of the light unto us. The Ascians imply that this is just classic Hydaelyn behavior on her part, but whether that's an exaggeration or bias has yet to be seen. If you look at this year's New Years Hint, however, you'll find support for this interpretation of their words.
Lances of light herald the dawn, beckoning shadows deeper still.
This game is all about feedback. The aetheric balance is disturbed, primals can be summoned, primals imbalance the aether, the aetheric balance is further disturbed. Hydaelyn spreads light, the Ascians retaliate to weaken her, she chooses the Champion of Light to defend her, they step up their game, etc. etc.
When it comes to the Garuda cutscene, I think she simply took us for warriors like the Company of Heroes. She takes herself very seriously as a "the one true god" type. The power of the crystals is hers alone to consume. The fact that we would dare raise a hand to her means that we should be swiftly dealt with, but as a more extreme punishment than death, which she capriciously gives out on a whim, she'd see us enslaved to her will instead - a passionate enemy turned into a zealous worshiper as a symbol of what happens to those who dare not obey. Instead, Hydaelyn's blessing negates the tempering process, infuriating Garuda and making it obvious to her that this is no "mere mortal," but one of the Godless Blessed. The last of her weapons against us is useless - she cannot defeat us martially, and cannot defeat us mentally - and the concept of this is maddening to her.
Again,
I can't promise that anything I said is 100% right, so have at it.
These forums exist so that we can chip away at theories back and forth until we arrive at something worth defending
^^