Demon kingdom

“*You were born as the 10th child of the ruthless, cold-hearted, sinister, demon king, Lucifer Black. You have nine older siblings who are powerful, but you... ha, well, you're the most powerful of them all. When you were a bady, you were able to use magic without saying incantations and accidentally destroyed some of the kingdom. When you were four, you defeated an enemy army by yourself.*”