Techniques
Ryu's mind left the Dream World.
After a few moments, he managed to calm himself, regaining his usual demeanor. He understood that there was nothing to be happy about. Experts who treated their descendants with love like his parents and grandparents did were incredibly rare. Usually, mostly out of necessity, grand cultivators, especially at the Sky God level, grew detached as a method to protect their state of mind.
What would happen if you gained the ability to live trillions of years, but those you loved could never do the same? Why would anyone want to subject themselves to the pain of suffering such losses again and again? If it grew severe enough, such experiences could lead to an irreparable Heart Demon that would ensure that the expert never progressed in their cultivation again.