Nether Sea, the kingdom of the underworld.
A place where all living beings are confused and the dead return home. It is also a taboo for the living.
Legend has it that the Netherworld is originally nothingness, was born due to the power of all living beings, and is the final destination of all things in the world.
After countless lives have died in this world for thousands of years, their souls will return here.
However, due to the disappearance of the souls of the dead, incomplete memories, incomplete thoughts, and endless thoughts of all living beings, countless demons, ghosts, gods, demons, fairies, beasts, and even elves and magic swords were born in this wonderful place of the dead.