As the story unfolds, Bell and his friends discover that a mysterious entity known as the "Wrath of the Gods" is stirring in the depths of the Dungeon. This entity has the power to destroy entire cities and is feared by even the strongest Adventurers.
The volume illustrates why Orario is so peaceful in Bell's time. The current stability was built on the blood and sacrifice of the Astrea Familia and others during this chaotic era. It serves to make the setting deeper; Orario isn't just a backdrop for adventure, it's a city with a violent, scarred history.