Moonshine.

Valerian stood beside the lady and said, "Then tell me more about the dungeon." 

Shiba shook her head and said, "The dungeon is like a cage where you get to fight with the world's horrors. These beasts are unlike normal animals; they die and vanish. After a few hours, the same beast will spawn in the same place." 

Valerian raised his eyebrow in surprise and asked, "Is that so?" 

Shiba nodded, "The dungeon is like a tower, but the floors go deeper under the ground. They do not have any sun or wind in there, but you can breathe. You can locate water sources in there if you follow the map." 

Valerian asked, "How does mapping such a place help?" 

Shiba smiled as she answered, "We dungeoneers all have one dream, to reach the last floor and find the door to the other world." 

Valerian became alert and asked, "What do you mean, the door to another world?"