Nine Thoughts Soul Master seems to be just one step away from being a Soul Emperor, but the difference in soul sense is vast, making it difficult for Nine Thoughts to manipulate the energy of Emperor-level Spirit Items and possibly causing the energy to disperse and collapse.
Fortunately, the difficulty Chu Mu encountered was one of the White Nightmare Demon Emperor's souls. The Nightmare Demon Emperor's soul was capable of backlash and would launch a spiritual attack on those who tried to use it to boost their strength.
Only those at the Soul Emperor level could withstand such a soul attack. Chu Mu, because of his half-demon status, had a strong capability to endure the burning of the Nightmare Demon's soul.
Now, the problem Fox Demon faced was whether the weak Nine Thoughts Soul Master could really grasp the Emperor Nightmare Demon's soul and make the White Nightmare Demon devour it obediently!
After Chu Mu left on his own, he looked for a secluded and undisturbed spot.