The reason for the sudden increase of four stars was not due to any random factors. At that moment... the Four Great Sword Souls transformed into four-colored rays of light and entered Xin Yun's body. With each expansion and contraction of Xin Yun's body, the energy of the Four Great Sword Souls all flowed into Xin Yun and was infused into the Dragon Ball.
Originally, Xin Yun's realm was stable at the strength of a One Star crystal. Now having risen four stars in succession, Xin Yun had reached the standard of Five Stars. The speed of this advancement was astonishingly fast, which sometimes is not a good thing, as it could likely lead to an unstable foundation. If Xin Yun did not refine this properly, it would be easy to lose control of the energy and thus succumb to demonic possession.
