Existing in "Blue Star Era 3024", human civilization entered the "Era of Beast Control" due to "revival of spiritual energy". The world is divided into seven major regions by "secret rifts". There are tens of millions of "spiritual pets" (including beasts, plants, elements, undead and other forms) living in the secret realm. Human beings live in symbiosis with their spiritual pets through "soul contracts" and regard "beast masters" as their esteem.
Spiritual pet levels: Mortal level → Spiritual level → King level → Imperial level → Holy level → Divine level (each level is divided into 1-9 stars). It can be broken through "Evolution Fruit", "Secret Realm Inheritance" and "Beast Master's Spiritual Power Nourishment". Some races have hidden routes of "mutation evolution".
Beast Master Level: Apprentice → Bronze → Silver → Gold → Platinum → Diamond → King (corresponding to the highest level of spiritual pets, the strength of mental power determines the number of contracts that can be contracted, and the king level can contract 9 animals).
