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The method by which the Mu Clan family could enable Soul Pets to rapidly grow and metamorphose was actually quite similar to that of the Eternal Spring Water. It was also a type of spring water originating from a special Spirit Place. This water was referred to by them as the "Mu Family Spring," because only members of the Mu Clan knew of its existence.
By Mu Qingyi's generation, the Mu Clan had nearly become a single line of inheritance, and only Mu Qingyi knew of this Growth Spring. Usually, when Mu Qingyi accepted disciples within the clan, she would give them diluted Growth Fountain as a gift.
Chu Mu needed the Growth Spring water of Perfect Emperor grade to accelerate the growth of a Perfect Emperor-level Soul Pet. To speed up the growth of a Perfect Emperor, the spring water had to be the purest and required in no small quantity.
