These Void Sky Sub-Cauldrons had originally split off from the Void Sky Cauldron. Though the sub-cauldron in Lu Xiaotian's hands was only a portion of them, it still shared some of their characteristics.
Perhaps after splitting into seven Void Sky Sub-Cauldrons, some of the patterns had collapsed, while others had not vanished completely and might have continued to exist in some extraordinarily hidden manner.
It was simply that Lu Xiaotian's attainments in the laws of space had not yet reached a sufficient level. Though he had spent no short amount of time refining the four Void Sky Sub-Cauldrons, he had failed to discover their deeper mysteries.
By chance, he had witnessed those Great Dao patterns within the tortoise shell. After studying them intently for a time, Lu Xiaotian repeatedly used the power of the spatial laws within him to imitate those Great Dao patterns. Though he gained nothing tangible, the process of constant imitation inadvertently resonated with the Void Sky Sub-Cauldrons.
Even if that resonance was still exceedingly faint, to Lu Xiaotian, it was like a sharp sword that had cut a thin seam through the fog before his eyes.
A surge of wild joy filled Lu Xiaotian's heart. It was the joy of someone who had sought the Dao for years without gaining anything, who had endured long periods of gloom and doubt, as though trapped in utter darkness, only to suddenly glimpse a ray of dawn.
Lu Xiaotian had not held out much hope to begin with, merely treating these Great Dao patterns as a long-term objective.
Now, the faint resonance of the Void Sky Sub-Cauldrons gave Lu Xiaotian another line of thought. He could not sense them by himself, nor could he even see those patterns clearly, but with the Void Sky Sub-Cauldrons, he could take a