Because he didn't have enough points and had nothing else to do, Song Cheng began to try practicing the "Taiyin Guiding Technique."
After going through the whole script, he generally understood the idea behind this guidance technique.
Firstly, being able to see the "Taiyin Illusionary Sea" was essential, so he had to break through the True Spirit Realm first.
Secondly, performing the "Guidance Technique," he would snatch the Taiyin Qi from the Taiyin Illusionary Sea and then transform it into a terrifying direct attack.
Although both Taiyin Qi and Yin Qi could broadly be called Yin Qi, they were actually different.
Broadly speaking, Taiyin Qi was a "Higher-tier Power" of Yin Qi, therefore it wasn't supposed to pass through a person; if it did, it wouldn't injure others but would instead harm oneself.