After the expedition that is done by Elaina and her grandparents, the designation level of the dungeon has been changed. Although the beginner adventurers are still allowed in the dungeon, they are not allowed past the illusion barrier for their safety. Those who have passed the prerequisite to dive into the labyrinth will be allowed to join and fight there.
Not only that but when the metric machine was brought out to measure the depth of the labyrinth, the Adventurer's Guild was shocked after seeing that the dungeon was very deep, much deeper compared to the one they call the "deepest labyrinth", dethroning it in the process.
