
Originally Posted by
Murataki
Ou'Hpat Obelisk is where the Emptiness-destroying Chamber of Eventide is, which is why it's so fucking shiny. No idea why it's full of displaced beastmen though.
The Chamber of Eventide is in the Grand Palace of Hu'Xzoi. You know the small dark room where you and Nag'molada found Yve'noile and met the new Phoenix? That's it.
The Ou'Hpat Obelisk are the burial grounds of the Zilart. Nag'molada says he must not let Yve'noile return to the mothercrystal from inside the Chamber of Eventide. Its now known as Temenos.
And of course, Apollyon was once known as Lower Promyvion, the emptiness that surrounds the final mothercrystal.

Originally Posted by
Murataki
And for that matter, I'm not sure why enhanced "prototype" forms of Zilartian biotechnological weapons are hanging around there either, since Nag'molada talks like they're brand new during 6-4.
In that cutscene, Nag'molada says that
his creation is a prototype based off of Zilart design. He also says the original design can be found in Al'Taieu.