Some wild speculation about a certain macguffin from 7.0

[MikkoAkure]

The thing that still makes me disagree with the Ancients as a theory on this (it resembles their stuff most of all potential contenders, but not so exactly that it's clear) is that 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.

How do we know that the only thing it can do or even if the only thing it was meant to do is interdimensional teleportation? Nuclear fission in our reality has been used to make weapons of unimaginable destruction but currently we mostly use it to heat water into steam. Considering what we know about both the writers as well as our Azem, it could very well be the Ancient version of the Ironworks' increasingly intricate kettles and originally designed to derive energy from an artificially created pocket universe in order to heat water to make tea but as a side effect and some tweaking it can open portals to other realities.

Right now it's a magical writers' tool of undetermined power, purpose, and potential meant to do whatever the writers want it to do and the only lead we have to go on is the Azem symbol. So far almost everything magical has been derived back to Amaurot or Allag but nothing we've encountered from Allag has the symbol for a Seat of Convocation member slapped on it.

We also don't know if it was OUR Azem who made it, ours was the last of a line and we know of one other. It could be that the device was originally made by Venat and the reason why the Milala were able to use it to escape the Fifth Umbral Era was with Hydaelyn's intervention. That could also account for Krile's particular affinity towards Hydaelyn over other echo-bearers, since she's the only Milala on the Source.