Immortal paths were kept secret for two reasons. The first reason was that an immortal path was extremely difficult to obtain, and no one wanted to expose it easily. The second reason was that the more people who know the method, the more competitors there will be for its corresponding immortal medicines.0

For example, the True Immortal Path was monopolized by the Lesser Immortal Realm. Within that realm, many True Immortals themselves don't even know what immortal medicine they consumed. 0

The true path might be known to only a tiny handful, ensuring that the number of competitors for True Immortal medicines remains small.0

If a medicine of the True Immortal Path ever appeared in the Nine Mortal Realms, the Lesser Immortal Realm could easily take it for themselves,...0