From the Vantage of the "Last Remnant" in Azys Lla, I can see 2 tower-like structures: The one in where Castrum Solus and the one in the center of the Warring Triad statues.

What really gets me is that the Tower where the Warring Triad are has 2 wings and one side is emanating "aether particles" similar to what's Antithesis/ Tiamat's prison and also in the Pappus Tree. I wonder if there's a connection there?

Speaking of "Last Remnant" I am curious as to why this small island was made worthy enough to pluck from the ground and levitate? Could this be related to the Remnants of Sephirot?

Time will tell, I guess