When an external incarnation had just been refined, it possessed only Qi Refining Stage cultivation and needed to cultivate like a true cultivator to raise its cultivation.
Moreover, an incarnation was not a true physical body and could not consume spirit pills to increase its cultivation. It could only refine and absorb the spiritual qi of heaven and earth to improve itself. The speed of its cultivation depended on the spiritual material used to refine it and the cultivation environment in which it resided.
The advantage was that an incarnation had no true meridians. As long as it was not made to do anything else, it could keep circulating its cultivation technique almost indefinitely, unlike a true cultivator, who needed rest to ease the strain on both meridians and spirit.
Another difference from true cultivators was that incarnations had no realm bottlenecks whatsoever. Even upon reaching the Golden Core Stage, they would not form a Golden Core, much less a Nascent Soul.
Because they lacked a Golden Core and Nascent Soul to store magical power, even if an incarnation reached the requisite cultivation realm, its magical power would still be weaker than that of a true cultivator. Exactly how much weaker depended on several factors, such as the spiritual material used to refine the incarnation and the cultivation technique it practiced.
The spiritual material used for Zhou Yang's incarnation was a seventh-tier spiritual material, while the cultivation technique it practiced was the supreme technique Donglai True Person had relied upon to ascend to immortality, the "Nine Heavens Primordial Yang Longevity Creation Immortal Scripture."
Thus, in terms of magical power, this incarnation was only about ten percent weaker than a true cultivator of the same realm. This could be said to be the limit of an incarnation's magical power without a