"He's divided his spirit into two? He actually cultivated the method recorded on the Monolith exactly!" He was shocked not that Long Chen had two Spirits of Qi, if he succeeded, others should be able too as well; he was shocked that Long Chen cultivated the Haven Heart Qi Method.
After meeting the Black Skeleton, Wei Wuyin came into direct contact with his soul and gained greater control over it. Due to this, he could split his soul into a spirit without the described method of severing a pre-existing spirit into two. He had remodeled the Haven Heart Qi Method into something entirely different.
