In this world, there are five realms or dimensions that have control or influence over the planet. The human realm is the weakest yet largest realm, inhabited by highly intellectual beings who rapidly advance their understanding and lifestyle. They have a unique grasp of nature, allowing them to invent new technologies, like the airplane which was inspired by the uplifted wings of eagles. However, the human realm is also prone to natural disasters, greed, corruption, war, and violence, making it the weakest realm overall.
The second realm is the beast realm, composed of monsters with extraordinary characteristics. It is the third-strongest realm on Earth. This realm has vampires, werewolves, cunning foxes, and other half-human, half-beast, half-spirit creatures. They have low mental development and tend to be divided, unable to freely traverse each other's territories. Beast beings can be found in the human, spiritual, and aquatic realms, but not in the immortal realm.
The immortal realm is the strongest of all, composed of supernatural beings responsible for maintaining abiotic factors and the elements of life. They have a strict policy against intermarriage to preserve their "blue blood," making them the smallest realm. Their ability to control the planet's abiotic factors makes them undefeatable, as they can render opponents lifeless by removing water and oxygen. Despite their power, they are generally friendly and do not abuse their abilities.
The water realm or kingdom is occupied by various aquatic creatures, including nymphs and merfolk. It is one of the most beautiful and peaceful realms, with over a million species. However, it is often targeted by the human realm, which hunts its inhabitants.
The spiritual realm is made up of spirits and is the second-widest after the human realm. It is the second-strongest, with powers similar to the immortals. Spirits live for 1,000 years before dying naturally, and can only be killed by weapons from the human realm or the sacred emerald blade wielded by the chosen one. The spiritual realm has been struggling in the absence of a chosen one for over a billion years, with its members often sent to the human world to survive.
Each realm has pathways that allow travel between them, but the spiritual realm's pathway to the human world has been destroyed, cutting off communication and travel. The spiritual beings have had to work together to ensure their survival in this predicament.