The growth of the Sun Tree requires Feng Qing'an's soul power, but it equally needs the omnipresent Yin Qi in the underworld. The same applies to the giant skeleton. As Feng Qing'an provided it with more and more spirituality, the skeleton could also absorb Yin Qi and would no longer remain just a uniquely shaped stone mountain.
Therefore, Feng Qing'an had never harvested it until now, out of necessity. However, it wasn't an impossible task. The mountain where the Sun Tree rooted had turned into a near-black crystal, which stored copious amounts of Yin Qi, enough for some time. He could figure out how to replenish it when it's used up.
A young boy brought a girl back to the human world and spent a passionate night. The phoenix was singing unceasingly. When dawn arrived, Nangong reluctantly returned to Youyou, while Feng Qing'an received greetings and blessings from friends, relatives, and villagers.
