Chapter 865: Mortal Saint Alchemist, Trauma of the Souls

Wei Wuyin was deeply familiar with the process by now, changing methods to adapt to certain materials ages, even their nurturing methods needed certain changes in extraction process to best draw out their greatest, purest essences and energies. The variation of the Alchemic Dao was one of the largest reasons for issues to rise during the concoction process, but his Celestial Eyes allowed him to see it all. 

Without the need to cause changes due to his Spiritual Sense and exertion of Spiritual Strength, he befitted greatly. There were certain cases where using one's spiritual strength could produce unnatural reactions that could severely affect the process.