The Tower
This is the main quest hub and base for the players. It is, basicall, what I need it to be. If I need a large traning space I can make it. If I need to add to the Tower, great. It's not actually a set layout.
Impossible Labrynth
The Assistants will always know exactly how to get to where they need to go, but no one else will, and even if the players try to map things out, I will intentionally switch things around on them. They can't know how to navigate the Tower on their own. Not yet, at least.
True Nature
The true nature of the Tower is that it is, in actual fact, Veza. In order to hide from Umumtu she transformed herself into The Tower, and has hidden the Tower from the rest of the Living Realm.
Location
The Tower is located right outside the Fields of Kemer. It's just hidden from the world.