It was already impossible to determine how many more types of Hunter's Breathing Techniques there were in the world. As for the 18 types of Hunting Techniques, they basically covered all kinds of strengthening directions. There were strength types, high-speed, tenacious, training, and so on.
There was also a special breathing technique called the "Primal Breathing Technique." It was said to be an incomplete version of the original breathing technique. The subsequent breathing techniques were all derived from this foundation.
Imperial hunters would more or less master a little bit of the "Primal Breathing Technique." It sounded famous, but it was the most ineffective breathing technique. The breathing technique from ancient times was crude, and the subsequent improved versions were getting better and better. It was not that the older the technique was, the stronger it became.