At the Spirit Growth stage, Yuan Dasheng needed to increase his Spiritual Nature until it reached ten completions.
Ten completions meant a qualitative change!
After reaching it, Spiritual Nature would recover by itself, endlessly regenerating. Otherwise, however much Spiritual Nature was used would be deducted, which was a significant disadvantage.
This was exactly Yuan Dasheng's situation.
Originally possessing eight completions of Spiritual Nature, after wear and tear, it left him with only seven-point-nine, unable to recover on his own.
Unless one day, he reached ten completions, causing a qualitative change. Only then could he begin to self-recover!
After reading this Jade Slip, Ning Zhuo's first thought was: "Choosing Yuan Dasheng's corpse was indeed the correct decision."
"According to the information given by the Magma Fairy Palace, choosing any corpse would only result in a Spirit Rhythm level mechanism. This was merely the first stage of the Dead Spirit Stage."