The four core elders were frost for a couple of seconds, before they stared at each other, the value or a half-immortal grade material greatly surpassed the one of a peak Stellar grade one, even if it is an incomplete kind of thing.
There is a reason as to why Heavenly Realm cultivators, can't enter middle or low ranked Stellar Systems, unless they suppress their cultivation which is hard to do the higher their realm.
It's not only a rule set up by the rulers of the Heavenly Quadrants, but a rule that the heavens themselves reinforce, the principle is similar to the one that states that for other Mortal Transcending realms to appear in a Star Cluster, there must be a pioneer.
The space, atmosphere, laws and spirit energy of a certain area will be reinforced due to the appearance of cultivators on the Transcending or Heavenly realms.