The Turning Yin Eternal Silence Armament required materials with the three highest-grade attributes: water, fire, and divine.
According to the basic principles of artifact forging, the stronger the spirit law's power, the higher-grade the required materials had to be.
Back when the Yang Star was made, the Tomorrow Society had hunted a World-Wrecking Demonic Monster to gather the materials, and because it was a single-use item, the materials had even been downgraded.
According to the basic theory, even if the Yang Star were made from World-Wrecking-grade spirit materials, it would still require the Extreme Spirit Attribute. Otherwise, its level would have to be raised, requiring the bones and flesh of a high-grade World-Wrecking Demonic Monster—or even a Beyond-Standard Grade one—to bear the Yang Star.
The materials required by the Double Unique Attribute made it clear that although the Unique Armament was powerful, its requirements were also extremely high. Saying that the Yang Star was cheap only meant that it was cheap compared to the strategic Forbidden Artifacts of the Cloud Heaven Spirit Sect.
Moreover, not every Unique Armament was suited to being a single-use consumable. At the very least, the Turning Yin Eternal Silence could not have its material standards lowered. Its minimum requirement was still World-Wrecking-grade materials.
Of course, if they could find spirit materials corresponding to the "Turning Yin Eternal Silence Attribute," they could also downgrade the requirement to World-Wrecking-grade.
Unfortunately, the Tomorrow Society had searched through all its records and performed countless deductions with the True Heaven Instrument, yet still could not find any. It was simply too rare, so their target remained the World-Wrecking level.
In the records of the Cloud Heaven Spirit Sect, the Cloud-Walking True Dragon was defined as having the water attribute and possessing the Wandering Void Divine Power. It could harvest materials