Entering the Heavenly Dao

 After having killed the patriarch in a most honorable manner, Kai Syaoran became the new patriarch.

He appointed new elders that he trusted and gave them his orders on how to run the clan. He then retreated into secluded cultivation to begin working on what truly brough him to this realm.

In seclusion, he brought out the thousands of hearts that he had ripped out of the chests of his victims and he began analyzing how the emotions were imprinted in this heart and how he could make the entire process simpler for himself.

Before beginning his true work, he wanted to ace sure that his cultivation was at the peak of this world. That way, he can cultivate in peace with the assurance that he could handle whatever the world threw at him.

It took him a few decades to finally come up with an art that allowed him to cultivate this system of cultivation without having to understand his emotions.