I’ve always thought Telogrus was part of K’aresh, makes the Ethereal connection make more sense imo.
Perhaps there’s some lingering essence of Dimensius there that she’ll try and capture. I think it could play out similarly to this:
Xal uses the essences of the old gods, dimensius, and the sunwell (probably corrupted) to fully restore/manifest Dimensius into the world.
Maybe the light crystal in the Arathi zone has something to do with it too since we know it is starting to turn to the void.