|The Earth was destroyed.|
Four worlds were created out of the ruin. Worlds for ourselves and the mensch: Air, Fire, Stone, Water.
Four Gates connect each world to the other: Arianus to Pryan to Abarrach to Chelestra.
A house of correction was built for our enemies: the Labyrinth.
The Labyrinth is connected to the other worlds through the Fifth Gate: the Nexus.
The Sixth Gate is the center, permitting entry: the Vortex.
And all was accomplished through the Seventh Gate.
The end was the beginning.
� Weis & Hickman, Into The Labyrinth pg. 9