Stage 4 Qi. It was created to be used by those who didn't have a soul weapon—releasing the special inner energy in one's self in a certain way.
This was what it was known as. However, that wasn't completely accurate. In fact, the truth was, in the fourth stage of Qi could be used by anyone, at least anyone with good control of their Qi; it was just harder for those with an ability since the feeling of summoning a soul weapon and using one's Qi for the fourth stage were very similar.
It was the trump card from the high-ranking members of the pure and the talented ones. Even after 1000 years, this skill was incredibly powerful. And during that time, Pure had discovered something, and those that used the fourth stage did as well.
While using the fourth stage, it was very easy for those to go over the natural Qi energy stored in their body and start using their own life energy.
