The contents in the "Great Wildness Sutra" were ancient and profound. Each words and sentences were very fantastic. That was a world that Zhang Tie had not touched before. The world was full of sutras, fingerprints, illusions, rules and new definitions about the relationship between human and everything else in the universe. It was completely different from that fighter cultivation system that Zhang Tie adopted since he was young. It broadened Zhang Tie's vision greatly.
Of course, animal controller was a profession in this age. This profession only existed less than 700 years. However, it was hard to say how long have human coexisted with everything else in the universe, including various wild animals. According to a common saying, people had existed at least 6 million years on this planet.