Master Bertram is so diligent in serving the royal family, what else can anyone from the Imperial Library say?
Several days later, Master Bertram found a few possibilities, one of which was witchcraft, the other was Track Skill, and the third was divination. Witchcraft was extremely popular in the ancient era, inherited by both the Human Race and the Demon Clan, and could compete with cultivation.
However, witchcraft is too mysterious, and many principles are not even clear to the witches themselves, knowing that it works but not why. The inheritance requires high talent, and over time it gradually declined.
However, witchcraft is unpredictable, and there may be a resurgence of certain inheritances.
Track Skill is similar to cursing, yet more complex and profound, and more difficult to defend against.