According to the records in ancient medical books, the most important aspect of soul tempering is to first force the soul out of the body, which is quite difficult to achieve for a cultivator. Peng Yue is well aware that he is currently in the Refined Aperture Stage, which is actually a realm akin to cultivating the soul.
However, at this stage, it's very challenging to separate the soul from the body. People can feel their soul drifting away from the body when dreaming, but that state is uncontrollable. Based on what Liu Chen knows, once one reaches the Golden Core Stage, the soul can temporarily separate from the body, although not for long. At the Nascent Soul Stage, the Nascent Soul can truly leave the body, which means the soul departs from the physical form.
