The Ultimate Creature That Started from Hell

Friends, have you heard of the story of the ultimate creature? Legend has it that in the late Edo years, the shogun secretly organized a group of death row prisoners to search for the elixir of immortality on a mysterious fairy island in the South China Sea... Enough, I have tasted enough stories about the God of the Earth, the Emperor of the Earth, the King of the Human Race, the Co-Lord of the Earth, the most powerful creatures in the sea, land and air, including the universe, so hurry up and read on! … (The main world is a mixed modern world composed of Hell Music, Kabaneri of the Iron Fortress, Demon Slayer: Kimetsu no Yaiba, JoJo's Bizarre Adventure, Pirates of the Caribbean, etc. Other worlds can be added as appropriate)