A wicked monster "Behemoth",who intended to attack the Elias through "Rice cake monster" in the past. The monster Behemoth transferred to a huge tunnel that has countless monsters living in it.
Since Levi the Elias guard of the royal family found this,he succeeded in preventing the monster's invasion. After this happend, he established the Coliseum in Jendia so that people could be trained to be stronger, enabling them to prevent monsters from invading in the future.
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