Underground Empire

The Empire where our MC begins in. Where the undead curse started. Separated from the Magic Empire due to a magic barrier. Also known as the Undead Empire. Currently ruled by the Undead Emperor.

STORY
[There were two princes with power (magic) that could rival the Emperor. The Crown Prince was weaker than the two, but with the help of the Royal Magician Leader, who hated Elementalists, and the Imperial Army, he managed to banish them underground.]

Originally, the Magic Empire had created giant facilities underground and left the monsters that were difficult to handle down there. However, the Crown Prince wanted to trap the 2 Princes and their forces there as well, as they were a threat to his power.

This included the Demi-Humans (who weren't accepted by the Empire), the criminals from various species, the monsters that posed a danger to the Empire, and the spirits and Elementalists. In exchange for all of them gathering together and leaving, they would be allowed to live.

It was a success. They resisted fiercely but were eventually chased underground... and were unable to leave.

"...Tell me more about how they were trapped."

[It's a type of prohibition magic. 100 light magicians and 100 dark magicians were gathered, and by sacrificing both their souls and their magic, they created a chaos element magic barrier. A barrier that separated the surface and the underground.]

"A chaos element barrier."

[It's as you think. It's a barrier that doesn't allow any living beings from escaping.]