Power

Simply put, this beast test was like a program running in a system. Higher systems could allow higher programs to work, and that system referred to the Illusory Appraisal Techinique, while the program was naturally related to all of the attributes of the Spirit Control Beast.

And the level up of the Illusory Appraisal Techinique is due to the learners' own comprehension and hard work. The more Spirit Control Beast they can differentiate, the stronger the ability of the Illusory Appraisal Techinique will be. When it reaches a certain level of interaction, the Illusory Appraisal Techinique will naturally level up.

Therefore, becoming a Beast Appraiser was not easy.