Well... I actually hadn't planned on writing this book, but those two guys, Black and White Skeleton, wouldn't let it go. They said it was to keep the underlings in line and make them understand that not just anyone could become the Lord of the Underworld. So I wrote it...
Honestly, I don't think it was necessary at all. Even if every creature in the Underworld died, I wouldn't. As long as I don't die, the Underworld will never collapse. And as long as the Underworld exists, new creatures will eventually appear to fill it...
P.S. The author is a high school freshman, so updates will be very, very slow...