Quote Originally Posted by Lyth View Post
Sanderson's first law is not 'Thou shalt not introduce in new world-building lore in the sequels of a serial work.' It's a principle of foreshadowing, in which you plant plot elements well in advance of them becoming plot significant so that the reader/viewer gets an 'aha' moment when you stab them with a plot twist.
Yes, but as Sanderson says he had already foreshadowed the existence of a secondary magic system in the first book, but still recognized that introducing it at the very end of that book to resolve the plot was erroneous writing. In the context of XIV, this is where I think the "missing expansion" between Shadowbringers and Endwalker, the original 6.0, would have significantly smoothed out the story. Introducing Dynamis there and allowing us to stew and learn more about it for a couple of years would have integrated it much more seamlessly into the narrative before we went into the final chapter.

On the subject of Limit Breaks, there's no clear cut line on what exactly is Aether and what is Dynamis. Emet, for example, uses the line 'Mine is the Aether!' when he uses a Caster Limit Break. Likewise, it's never definitively stated what Elidibus uses to power his Limit Breaks.
As you point you, we lack the rules about any of this, and so are left with nothing but headcanon to fill the blanks. For example, all player Limit Breaks are observed as aetherical by the characters in-universe through the EE, which would suggest that, if LBs are indeed partly Dynamis, that both aether and Dynamis are combining to produce the effect. Which runs in contradiction to the notion that they are incompatible.

So how did the Final Days as a Dynamis based phenomenon have any effect on the Ancients? It affected their creation magic. And what is the modern day derivative of creation magic? Primal summoning. Meaning that if Meteion can warp an Ancient's creation magicks on Etheirys from the edge of the universe, then it wouldn't be a stretch for us to unconsciously use Dynamis inside a primal.
As above, there is no explanation. We don't know how the Ancient's magicks were warped, only that concepts were seemingly siphoned from their minds and made real by creation magics taken from their control. We have no idea how Dynamis could be capable of this. And with the issue of the Primals, there's also the fact that they are formed partially through faith and prayer - Something that, now, we could easily conceptualize as Dynamis. But if so, that raises the question of how Hydaelyn and Zodiark could even exist, given the Ancients evident inability to manipulate Dynamis.

While I am interested in the ways Dynamis could factor into the story in the future, at the moment I have my doubts as to the question of whether or not they'll get around to explaining some of the oddities surrounding it, such as what is and is not Dynamis on a basic level. To do so in-game we might need to return to ARR-levels of exposition dumps. Otherwise we'll be left awaiting a potential new EE in the future.