Sometimes, Shen lang was really like a rich second generation who did not need to work hard.
Dragon's enlightenment and Dragon's control were both extremely difficult processes. It required a huge amount of energy, time, and wisdom.
The ancient dragon was very arrogant. It would be controlled by humans to fight, but it could not be said that it recognized a master, but it was still a kind of loyalty in the end.
This also required a contract, a very, very profound spiritual contract. It required a very high level of Dragon perception to sign such a contract with the ancient wyrms. Moreover, this kind of contract was directly engraved into the dragon's soul and bloodline, which was almost permanent.
At the very least, with Shen Lang's current Dragon comprehension ability, he could not sign such a contract. It was too profound.