Occasionally, a Golden Core Instructor was responsible for substitute teaching.
This Golden Core Stage Instructor was a direct disciple of Elder Gongsun and also a true disciple of the Inner Gate.
However, other courses focused on Tao Cultivation skills were not so strict.
For example, the one teaching Refining Rune was an externally hired Golden Core Instructor;
the one teaching Alchemy was a Guest elder in the Feather Transformation Realm;
the one teaching Artifact Refining was an ordinary elder of the Inner Gate;
there were also ones teaching general knowledge of the Cultivation World, history books, and classics, some of whom were externally hired instructors with low cultivation levels but had traveled extensively outside for years, broad in knowledge, old in age, but only at the Golden Core stage.
Without understanding these, one would never know who, standing in the Tao Teaching Room, was lecturing them, whoever the sacred figure might be.
