*The earth in this novel is different. Pure fantasy!*
The energies have swept through the earth.
Each continent has been 'blessed' with one pillar that was commonly known as the dungeon. Those dungeons have been then exuding the energies throughout the whole planet and so the earthlings became eligible to wield the supernatural power.
Except for the survivors, no one knew how to properly utilize it and what kind of supernatural power they have actually gotten!
This is when the dungeons step in.
The dungeons have had let out the allure that just pulled the earthlings in. They believed that the answers they have been seeking were gathered here. Of course, it's not like every survivor could spend every second of their time to teach others.
Furthermore, the united forces of each continent had restricted the survivors when it comes to spreading their knowledge about energies.
Thus, people had rushed to the dungeon to change their lives.