About one hundred and thirty years ago, humanity began to attempt various expedition actions,
for the first time discovering the "Ancient Stone Tablet" engraved with demon information among the remnants, and the information recorded on the stone slabs allowed humanity's understanding of demons to significantly increase in a short period.
This included races, communities, beliefs, hierarchies, and the rules of the demon world (such as land deed wars).
The information on the slabs was primarily deciphered by the Secret Language Knight Order,
at that time, the most important information obtained was about the 'hierarchy of demons'...
Due to the existence of the concept of levels, and the connection of each level with "Truth",
humans became aware of an important issue, if a large-scale war between humans and demons were to break out one day, the key to influencing the outcome of the war would not be numbers, but hierarchy.
Therefore,
