Vajra Punch was a middle-ranked combat technique, but it was not one created by modern martial artists.
It was an ancient fist combat technique. Rumor said that it was passed down from a Buddhist sect thousands of years ago, being created by a Buddha from that era.
Of course, it was only that–rumors. In the eyes of the modern people, the so-called Buddhas or whatever were just powerhouses advancing to Grandmaster-level.
Vajra Punch was a technique that necessitated the union of one's bodily actions, speech, and thought–or rather, in Taoist terms, one's essence, spirit, and soul.
This was a middle-ranked technique that many upper-stage Rank-3 martial artists learned, as it worked as a big push toward Peak Rank-3.
"Vajra, a being with a murderous gaze. Even Buddhas can be angered too…"