The Secret Realm World is not entirely designed according to the game.
This Demon Dragon Valley doesn't have a setup where there are five fortresses, each with a boss standing on the city tower.
The idea of the five regions was proposed by Secret Realm agents because there are exactly five areas as you go in. The first one, the Ancient Forest, is on the outermost edge. Here, captured humans and demons live together. They are at the lowest level of Demon Dragon Valley, unqualified to enter deeper, and can only stay to do menial labor.
The boss of this area is a Wild Boar Demon, standing two zhang tall, weighing like a mountain, donning heavy armor forged by human blacksmiths, and wielding a warblade that requires several people to lift.
