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However, this situation required extremely strict demands on the cultivation techniques.
Different cultivation techniques mean different routes for True Qi to flow through the body's energy channels.
The energy channels in the body are not independent of each other but are interconnected and even overlapping. Cultivating a single technique does not lead to conflicts between flows of True Qi.
But cultivating more than one, with differing characteristics of True Qi converging within the body, could at the least destroy all energy channels, and at worst, cause the body to explode and perish.
Unless one could find two cultivation techniques with completely non-overlapping routes for True Qi, allowing each to occupy its separate channel without conflict, it would be possible for both yin and yang types of True Qi to coexist.
But doing so would be pointless...