Wu Qingxu said in a deep voice, "Zhang Tingzhi saw it accurately. That is indeed the case, and it is also a major obstacle standing in our way."
Zhang Yu had seen through the weakness of this method at a glance. Ordinary vessels of reliance might not be so difficult to obtain, but any such vessel capable of helping someone reach the Upper Layer would certainly have to be acquired from the power of the Upper Layer.
For living beings of the lower levels, whether divine descendants or cultivators, under ordinary circumstances, without guidance from the power of the Upper Layer, it was impossible for them to break through on their own and reach the higher realm. Even if there were occasional exceptions, such methods could not be widely applied.
This meant that to acquire a vessel of reliance capable of breaking through to the Upper Layer, one first had to find a way to act upon some wondrous lifeform of the Upper Layer.
He asked, "May I ask, Wu Tingzhi, where did these wondrous beings of the Upper Layer come from?"
Wu Qingxu replied in a deep voice, "The vessels of reliance we have obtained thus far were all refined from wondrous beings of the Upper Layer suppressed within our Prison of Suppression. We do not permit Changsun Tingzhi to tamper with any imprisoned cultivator, even if that person was once our enemy."
Zhang Yu nodded unconsciously. That explained it.
He also greatly agreed with Wu Qingxu's latter remark. If Celestial Xia did not uphold its bottom line, it would only stray further and further down certain paths. If that happened, they would be no different from their enemies.
Yet he could understand the purpose behind this approach. It was meant to provide disciples of poorer aptitude with a