Based on his speculation, Zhou Tian believed that the ancestors or followers of these living beings might control at least a part of the World Rules of this place. They then set up the sacrificer occupation, projecting the rules they controlled through offering sacrifice, ultimately providing those living beings with areas to live within the world reflected by the Rule Projection. Otherwise, considering the strength of these living beings, which was barely strong, it's speculated that it would already be challenging for them to avoid becoming food for those roaming Giant Beasts, let alone becoming the mainstream inhabitants of this world.
Of course, everything was merely Zhou Tian's speculation at that moment. In fact, Zhou Tian couldn't be sure whether the living beings he encountered really controlled the World Rules of this world. However, regardless of anything, since Zhou Tian had such an idea then, it was inevitable that he would take action at that time.
