Stars were mighty figures who had half a foot into immortality. Although there were more stars in the Weiyang Dao Domain, this was due to the large number of stars, and most of them were at the mortal and yellow levels, but even so... The star realm was still a terrifying existence that could support a galaxy by itself.
Not to mention a high-grade star.
For example, Chong Weizi, as an earth-grade star, was already the Second Dao child of the nine regions road, the first sect of the left path of the holy region. From this, one could see that high-grade stars were extremely powerful and rare!
As for the heaven-grade... that was a method that only the unending royal family could grasp. A heaven-grade star, even if its cultivation was only at the middle stage of the star realm, killing Chong Weizi... Although it was not an easy task.., however, it did not require too much effort.
That was also one of the reasons why the never-ending royal family had remained strong for generations.