Octagram

When the time comes for the birth of a new Demon Lord, the other Demon Lords will not stay silent. If a fool freely calling himself a Demon Lord, he or she will be killed because they invoked the Demon Lord’s wrath. However, if there was a person who can survive against the other Demon Lord’s wrath. Such person, if they had the ability, he would be recognized as a Demon Lord.

But, Demon Lord with such ability was not a common occurrence. Therefore to claim a stranger as a Demon Lord, it was necessary to get the support of at least three or more Demon Lords. If you messed with the new Demon Lord, the supporter Demon Lords will become opponents at the same time, so was the requirement.

To become a Demon Lord and getting the support simultaneously, one must devastate a human city. In doing so, it will become the news of the birth of a new Demon Lord.

World War
This was a turbulent event where new demon lords replaced the old. This event would occur once every 500 years. At the same time as Karion three other demon lords were born. Frey is one of those. Considered the youngest, with least experience in the war, are Demon Lord Karion, and the last to be born, Demon Lord Leon Cromwell. The six new demon lords were thus the members of the new generation. The old generation, on the other hand, has survived over two such wars; their strength far surpassing the rest. Therefore, most of the new generation demon lords strive to expand their power.