Codex of Dragon and Phoenix

Codex of Dragon and Phoenix is a Standalone Orthodox Manual obtained from completing the Special Adventure Hidden Dragon and the Perched Phoenix.
It can be trancribed in the Manual Pavilion using the "Knowledge" option. However, the Special Adventure is repeatable and teaches this Manual without Inspiration cost, whereas learning from the Manual Pavilion would cost Inspiration, so it should only be done if the cultivator can't fulfill the Special Adventure requirements.