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To become a cultivator in Lu Country, there are only two criteria:
First, refine True Qi.
Second, learn the Three Arts and Five Spells.
Refining True Qi isn't too difficult, especially with Lu Country's current "blood test selection" method, which screens for those who have a Spirit Root—a seedling for cultivation.
As long as one can clearly remember the pathways of the human meridians and various major acupoints, and tries following the specific routes about ten times, one can basically complete the Grand Circulation and refine True Qi.
However, those who haven't memorized any knowledge, don't know the route of qi circulation, and can still refine True Qi just by trying randomly are usually called "Innately talented cultivators."
Yan Yu asked Xie Ruoxi to continue her breathing exercises and Qi Refinement, then he began to scan her body with his Divine Sense.
Hmm, indeed there is a sensation of Qi.