I realize that I am pretty late to ask this question, but I have only recently picked up this game again together with my sister, which has been a great experience due to always having somebody to talk to whenever the story leaves us stunned and wide-eyed ^^
In one of our discussions we were talking about Estinien and how he has kept most of his abilities even after the destruction of both of Nidhogg's eyesand looking even more badass than ever judging by that Endwalker Cinematic Trailer, and I felt that could have been easily explained by him becoming a host for, and even briefly transforming into, Nidhogg himself, thus keeping lingering traces of draconic power that enables him to function as a Dragoon even without having to draw powers from the Eye.
The same could be said for most of the lesser Ishgardian Dragoons, seeing as they all contain heavily diluted remnants of Ratatoskr's lifeblood, hence why they're capable of the iconic gravity-defying feats that we know and love them for.
...but what about our Warrior of Light?
I have to admit that it has been a while since I played through the Dragoon Job Quest, but as far as I remember, we too communed with Nidhogg's Eye for a while, which is what enabled us, a non-Ishgardian, to perform the crazy leaps and jumps to begin with. Later on Hraesvelgr is kind enough to serve as our new source of power by lending us his Eye, but what happens after that?
- Do we remain bonded to Hraesvelgr even after we return his eye, just as Estinien was able to draw on Nidhogg's Eye's power even while it was kept in Ishgard and he was fighting Dragons outside its walls?
- Has Midgardsormr been our source of draconic powers all along?
- Is our Soul Crystal enough of a Power Source to replace the Eye and overcome the lack of draconic blood?
I am sorry if I am asking some very obvious questions, and I am sure that they are probably answered to some extent in the Eorzea Encyclopedias, but unfortunately I don't have the means to buy them right now, and cursory searches on Google only provided me with some vague answers to that question.
Not that it is particularly important of course, nor does it impact my enjoyment of the game, but I was simply wondering of there were any Loremasters out there that know the answer to my question, or whether or not this is actually common knowledge and I've just completely missed it while playing the game T.T