The Reasoning behind The Sundering? (*6.0 Endwalker Spoilers*)

[Absimiliard]

So I was a tad unclear when writing that, but I wasn't referring to the axe, but rather the final ring of light for the last phase in the Hades fight. I previously made the claim that one wasn't the Blessing and got corrected, and it's certainly unclear in the script we usually see if it really is the Blessing or if it's Lightwarden Juice, but the buff itself (including what it gets replaced with if your team struggles enough that it runs out) makes it clear that's Hydaelyn's doing. Hades also has more script than he gets through in your average Normals, where it becomes clear that the ring of light you're fighting in for that last stretch is Hydaelyn's work, and he recognizes it as the light that split his world.

A bit (read: very) late on getting around to this, but I just so happened to get the Hades fight in trial roulette yesterday and remembered this portion of the debate. I looked at the buff you get during the last phase, and the text for it says outright that you are using the "light trapped within." The ring you fight in, as well as your ability to break free from Emet-Selch's spell in the first place, are quite clearly intended to be the result of the light you absorbed being put to use. This is something enabled very likely through a combination of Venat's ward and Ardbert's sacrifice, but it is not a direct act on her part.