the underworld, also known as netherworld in short hell. the world that exists directly beneath the land that we live. demons rule over this land and the ones that rule over those demons are known as demon kings.
the underworld has 4 demon kings. lucifer, leviathan, Beelzebub, Santanas. it is said that these are the names of the demons that originated the demons. in honor of them, the demons started to change their family names into one of these four names once they become the demon kings. and the present four demon kings that rule over this place is the 2nd strongest demon king generation among all the generations that ruled.
demon king Solomon lucifer is the strongest of all the 4 demon kings of the second strongest generation demon kings. the person that wields the power of destructio
