To subdue a Spiritual Body, he had to split off a trace of his own Spiritual Sense and imprint this separated mark into the Spiritual Body, thereby gaining control over it.
As long as this trace of Spiritual Sense could be branded within the Spiritual Body, whatever it did would be determined by a single thought from Chen Mo—a thought for life, a thought for death! Moreover, once this Spiritual Sense mark had been imprinted, it could never be removed. Only the two methods mentioned earlier could erase it.
However, splitting off such a trace of Spiritual Sense was extremely difficult and agonizing. Afterward, Chen Mo himself would need a long time to recover. Splitting Spiritual Sense inflicted trauma upon the soul, an experience of pain beyond measure.
Not only that, but the soul injury caused by the split also needed time to be nurtured and healed. That time might even be endlessly prolonged. In the Cultivation World, once the soul was injured, it was exceedingly difficult to recover. Some injuries lasted a lifetime, causing one's strength to decline and sending one directly back into mortality.
Fortunately, Chen Mo not only had Spirit Nurturing Pills on hand, but also Heavenly Heart Grass and several other spirit herbs that could slowly restore the soul. Therefore, splitting off a trace of Spiritual Sense was not much of a problem for him; he would simply recover more slowly.
Perhaps if he found some Soul-Calming Wood in the future, he could split his Spiritual Sense several more times without any issue.
He actually had a piece of Soul-Calming Wood in his possession, but he could not bear to use it. Once it was lit, obtaining another piece would be far too difficult.
This kind of Soul-Calming Wood plant was truly difficult to find on