Some wild speculation about a certain macguffin from 7.0

[Anonymoose]

But also... uhm, can I ask for detail on 'Preservation failed to get the artifact to work'?

Robor & (Alayla)
As those around them froze to death, our ancestors looked to a mighty relic for salvation. By its power they opened a portal, and used it to flee to another reality. <...> (The key is none other than that relic, and it has been in the safekeeping of our people since time immemorial.) <...> When lightning threatened this world, we attempted to use the key to flee again like our ancestors once did. Alas, no matter what we tried, we couldn't invoke its power. We had all but given up when Preservation approached us with an offer of partnership. <...> By augmenting it with electrope, Preservation did succeed in opening a portal. Yet they could never grasp how they had managed to do so, much less the underlying principles of the technology. To this day, not a single person understands the mechanics of interdimensional fusion. Let alone who imbued the key with its power, when they did so, or why.

If I'm interpreting the summary correctly, it worked "as intended" for the Speaker, then not for the Milalla's descendants, and not for Preservation, leading to electrope-based augmentation that eventually stumbled over a jailbreak for the portal feature. Desperately wanting to survive the collapse of your world is then perhaps not sufficient to activate it.

...the current skillset the key's been shown to have would be utterly worthless to them. The Ancients wouldn't have needed a way to cross shards because the shards didn't exist at their time, and the Ascians wouldn't have needed it because they could travel between shards pretty easy. So either the Ancients didn't make it, or they made it for a reason that up until now has never been stated. And that latter one sounds too sloppy for the XIV writers.

Data correlation is a messy process until the puzzle is actually solved and you can trim away the excess.

If the story is introducing multiple new Azem connections through the Milalla at the same time post-Endwalker (e.g. the sun-themed sanctuary, the relic symbol), then it would not be unreasonable (in my opinion) to explore potential anticipations of further Azem-related connections in whatever future plot that connects to (including ones that act as "new revelations" expanding on existing content).

However, as soon as one gets specific on what they might be, the house of cards gets a little too high for comfort.

Random example, Robor questions what the true nature of interdimensional fusion is, and why someone would imbue the artifact with that power, and when that might have happened. It stands to reason (in my opinion) to anticipate that those are questions that are intended to be answered. And - if the all the revelations in the same ballpark as the artifact have been related to Azem so far - would not one start in that same ballpark when anticipating those answers, and then work outward from there?

Except...where can you even go from there, with regard to Azem, without the house of cards immediately becoming too high to put any weight on? Following through my knee-jerk first thoughts mentioned above: If the Key is simply a means of travel - sure, that's a suitable invention for the Traveler - but it would mean either the Key worked on the unsundered world and only incidentally works inter-shard by virtue of that, or Azem knew the sundering was coming and created it as an emergency tool. That's a pretty big can of worms to open unprompted, but I wouldn't argue the story is devoid of potential foreshadows to that revelation, either. In either one of those cases, though, it might make sense to limit its use to Azem (or shards thereof), simply for the sake of security - or hope/faith that their future selves were as trustworthy when the chips were down.

Edit: Notice that the Milalla temple in Dawntrail is filled with the same ostensible sun motifs that appear on the Aloalo Island boss's outfit, in the same sun-orange hue as the Azem crystal/symbol.

(Before anyone jumps this gun, yes, the short story focuses on Azem creating an artifact that reduces "the traveler's burden" and "forgets" the crystal in Hythlodaeus's office. The short story also, depending on the language, declares it to be blue, so we might be stuck with that.)

[Cleretic]

If I'm interpreting the summary correctly, it worked "as intended" for the Speaker, then not for the Milalla's descendants, and not for Preservation, leading to electrope-based augmentation that eventually stumbled over a jailbreak for the portal feature. Desperately wanting to survive the collapse of your world is then perhaps not sufficient to activate it.

Yeah, I disagree on that interpretation. That quote sounds like Preservation did make it work, they just didn't understand how. There's no 'Preservation's failed attempt' there, and what little we know about Preservation does suggest that 'put it in an electrope machine' would be their first plan anyway. And not necessarily a bad one, given that electrope manipulation itself stems back to Aloalo.

My personal running theory is that the key, appropriate to its name, does absolute sod-all by itself but can power something else to do dimensional whatsits. Preservation basically blindly reverse-engineered a 'something else' that the people of Aloalo also had and used, that got forgotten over the ages thanks to random quirks of history and record-keeping. In fact, I wouldn't be tremendously surprised if we've seen evidence of it ourselves: the larger statue of the Speaker we find in Aloalo's secret route is holding a big amber orb that doesn't seem to be reflected in the golem we actually fight.

As for the origins of the key itself... yeah, I can buy that it's auracite, but my suspicion is that we don't yet know its creator(s). Again, I've personally ruled out the Ancients and Ascians; the fact Aloalo's people already had it rules out everything after the Fifth Calamity, so everything modern and the War of the Magi participants are out; and best guess on timeframes also rules out any known civilizations from the First or the Ninth. That leaves our options pretty slim:

• Ancient Doma,
• Ancient Bozja,
• Ivalice,
• Allag,
• Goug I guess,
• Some group in Meracydia,
• Some group in Tural that predates literally every figure or group we just met in Dawntrail,
• Pre-Flood of Darkness Thirteenth society somehow,
• Or a completely incalculable unknown, maybe from somewhere we haven't been or an era we don't know much about.

I don't have concrete ways to rule most of these out, but I've got gut-feel 'that doesn't seem right' responses to most of them; it just doesn't look or smell like their thing as we understand it. Couple that with the fact I just think us not already having the answer is more complelling, and yeah, I think we literally can't even make an educated guess yet.