Simulating Ancient Times, I Created a System of Humans and Demons

In ancient times, humans, demons, demons and other major races fought against each other. But even though there is spiritual energy in the world, all races don't know how to practice it, so they can only fight it physically. Xu Chen traveled through time from a student. As the son of a leader of the human race, he awakened to the ancient simulation system. "In the first year, you had a special physique and noticed the spiritual energy between heaven and earth, but you were unable to use it for your own use." "In the second year, you tried to bring the spirit into the body, but it had no effect. Instead, the breath became weaker." "In the third year, you tried to use medicine to assist. It had some effect, but you died of poisoning." ..... Xu Chen was unwilling to give in and started the second simulation. "You found the right medicine, and accidentally synthesized the spiritual fluid, which contains a lot of spiritual energy." "You successfully attracted the spirit into your body, your strength surged, and you knocked away a monster beast with one punch!" "You name this stage, guiding spirits!" "The simulation is successful. You created the realm of cultivation in ancient times and are the ancestors!" ... Starting from the human race, Xu Chen started to simulate the major races step by step! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.