Zhou Heng picked out a dozen pieces of metal from the space artifact, all of which were of the Sublimation Realm level.
There were higher-grade materials available. The Zhou Family was quite wealthy, possessing a large quantity of Creation Realm materials. However, the key issue was the Gold Devouring Clan's bloodline showing no reaction to Creation Realm materials, rendering them useless to him.
Let's not worry about that for now; restoring his normal size was the most important thing.
Zhou Heng, carrying the materials, returned to the Immortal Residence and immediately began the refinement process.
The limit of the Gold Devouring Clan's bloodline was between Sunshine Emperor and Sublimation King. Zhou Heng found it strenuous to consume materials of the Sublimation Realm but decided he could not bear to continue in the body of a child anymore.
Slowly refining the precious materials, he extracted the metal essence to strengthen his divine bones.