Zhang Tie had only implemented soul-based incarnation method a few times. In the posthumous paper, Cloud Crane once warned that soul-based incarnation method required a bit source of spirit and soul of its user. It was the biggest shortcoming of soul-based incarnation method. Therefore, cultivators of Great Wilderness Sutra could never constantly apply the soul-based animal controlling skill. With one more incarnation, the source of spirit and soul of one's original body would decline a bit. Zhang Tie was afraid of having some sequelae after applying soul-based animal controlling skill previously. However, after eating the fruit of source, Zhang Tie finally understood that he didn't need to think too much. Because the strength gifted by the fruit of source was the very wisp of strength that had escaped from his body when he fixed his incarnations.