So I have two theories about Pandaemonium:
1.
Could it be that Auracite is literally crystalized Dynamis, or something similar? The connection seems obvious to me, since Auracite turns people with negative emotions into monsters, while giving people with heroic resolve, like the Zodiac Twelve of Ivalician Legend, power to succeed against all odds.
2.
The answer to how the Twelve reached godhood, or how Hydaelyn gained enough power to face Zodiark at his full strength is still a muddy at best. Is there really good reason to believe that Venat's sacrifice to become Hydaelyn was truly enough to even the scales against power gained through the sacrifice of billions of people, considering Venat had to keep her knowledge about Dynamis mostly secret? I don't believe it.
But: Pandaemonium has taught us that the Heart of Sabik has existed on Etheirys even during the times of the ancients.
What if the Heart of Sabik was not the only piece of Auracite on Etheirys during the time of the ancients? It seems likely there could have been more, because in the current setting, Auracite is not only found on the Source, but on other shards as well, like the Thirteenth.
What if Hydaelyn and her followers found Auracite of their own, and used it to gain power, like the Zodiac Twelve of Ivalician legend?
If Dynamis and Auracite share a connection like I suggested, then Venat would recognize this and and be able to use it to her advantage.
I think this would be a perfectly clear explanation for how Venat and her followers gained enough power to change the world as they did.
Final thoughts:
Nevertheless, I believe Auracite will still have a big part to play in the future. It would make sense, because the lore implications of Pandaemonium are quite a big deal