To be able to control powerful Demon Beasts, besides a Beast Taming Secret Technique that grants life-and-death control over them, there is one other fundamental requirement: one's Divine Soul Power must be sufficiently strong!
If one's Divine Soul Power is lacking, even with a Beast Taming Secret Technique, one could at most control one or two small birds or beasts as pets—a simple amusement. How could they possibly command truly powerful Demon Beasts?
It was unknown if this bare-chested man was born with a powerful Divine Soul, or if he'd had a fortuitous encounter that strengthened it, allowing him to achieve Entry Level in the Beast Taming Secret Technique.
But regardless,
the small mountain of a giant rhino beneath him was proof of his strength in Divine Soul Power!
Furthermore,
after a Cultivator reached the Qi Introduction Seventh Layer Realm,
their Divine Sense would undergo another transformation and become even more resilient.
