If a person has lived for thousands of years, possessing supreme power, unparalleled beauty, wealth beyond measure, unrivaled Martial Arts, and he still lives, continues to live... then, after thousands more years, having acquired everything he hadn't possessed before, and he is still alive, then he must still want to obtain something more difficult to achieve—happiness!
Yes!
Happiness!
Because by this time, he has had everything, tried everything, experienced all the happiness that others could only dream of in their entire lives, and at this moment he will feel lonely, because it is only then that he discovers there is very little left that can make him happy.
Everything others want, he has had. What new things are there that can make him happy?
This is crucial.
So he begins to search for more novel things that can make him happy, and if there are none, then he destroys.
