In the imaginary world in my head where the final (Phase One) expansion brings us full circle back to Hydaelyn, Ascians, Sharlayan, the Brittlebark half of Mor Dhona, lost 1.0 story trajectory, and the starting city-states, the Sacrarium is a place you can enter just by talking to the NPC out front and being ported in.

Seems like a good time for the high and mighty (the Sect of Nald, their wealthy patrons, Dewlala, etc.) to bolster Arrzaneth's resources.

Buuut in reality it's just trapped in the time bubble with the flaming wreckage in Gyr Abania, I guess.