Cadheus was not the largest plane inhabited by humans, but it was the most prosperous. This continent naturally contained more than a dozen portals leading to various other spaces. In the spatial bubble structure diagrams imagined by scholars, Cadheus lay at the center of all the spatial bubbles, surrounded by more than a dozen of the most famous and vibrant worlds. (Here, "world" was merely a common local term and of course did not refer to the universe.)
It was precisely because of this uniquely advantageous structure that this space had become an undisputed transportation hub. Besides humans, who made up more than half the total population, the other races had also established their own cities and outposts in Cadheus. Even during wartime, when the various human races fought among themselves, Cadheus maintained its role as an absolutely neutral sanctuary under the restrictions of an ancient pact.
Many scholars even believed that, apart from their reproductive rate and learning ability, the most important reason humans had become the most prosperous race in the world was that they had discovered Cadheus first, thousands of years ago. This had given them control of the most important chokepoint in the world.
Cadessa City was a large city located slightly west of the center of the Cadheus continent. It was surrounded by mountains on three sides, while the fourth faced a vast red-soil plain. The city had been established by the first human exploration party after discovering the Cadheus plane. At first, it had been nothing more than a camp, but it had now developed into the grandest and most prosperous metropolis on the entire continent. Humans made up the majority of its population, though a third of its residents belonged to other races. Envoys from all the planes had established embassies and offices