According to the archmage, the empire was founded by refugees. They fled from another empire that had been taken over by demons. Hearing about demons, I look at Drog.
"Drog, do you know of any other demons on this planet?".
Drog says "There are others here, they are far away but I can sense them."
"Can you say anything about them?"
Drog says "I can sense many of them, probably hundreds, and seven I can sense clearly. They are demon lords."
"Demon lords, huh, I take it they are immensely powerful?"
Drog says "Yes, they are the strongest apart from a demon king. But there hasn't been a demon king for a long time."
"Why not?"
Drog says "Because becoming a demon king takes a lot of power and the other lords fight hard to make sure no one else becomes king."
"So, they are all too busy fighting each other to gain enough power to become king."
