Someone in another thread asked the question of the Jailer, “why are you invading another plane of reality when you’re not even out of the Maw yet–not even finished conquering the Shadowlands” and I wanted to address this question in detail.
Here is the truth of the matter.
Korthia has been inspired by Kur, which for all intents and purposes was the original afterlife that was conceived in our world. Has one not ever contemplated what if that all the myths surrounding the afterlife and the world beyond are not myths, or at the least have some degree of truth in them?
If this is the case, the rules of the original Shadowlands were originally governed by simple Mesopotamian rules and laws, and at some point in time, a sense of Order was established to the Shadowlands, similarly how to in our world, the afterlife went from the Mesopotamian system, to the rules of reward/punishment that came later with Christianity/Islam, and so on.
Therefore, as the original afterlife was no longer needed, Korthia eventually disappeared into the in-between, and we know that the motivation of Sylvanas is to tear the current system of order in the Shadowlands down, to replace with a system that is just. The Jailer’s motives are still unclear, but whatever the case, if you have a system of reward/punishment that you want to maintain where all souls are judged for their actions in life and whatnot, one place you are not going to want souls to go, is the original afterlife, where they find out the truth…that in reality, it was all simply a construct of control.
You see, if you do a bit of research, you will find in humanity’s original construct of the afterlife, there was none of this reward/punishment, your soul simply continued existing…and all souls, good and evil, went to the same place. In short, it was simply a shadow of the actual world, the only downside of course was that everlasting life was reserved for the Gods. Anyway, that’s neither here nor there, but imagine for one moment…if the original afterlife still exists in some form, what kind of ancient knowledge and artifacts of the Gods of the cosmos still exist there??
No wonder archeologists are curious about this place and glad we are getting archeology back in some form.