3 Slaughter Points to go from Advanced to Expert, 6 to enter Mastery, and 9 to finally enter Perfection.
One thing that was intriguing was that most non-daoist arts, which were essentially mortal mundane techniques like those from martial arts, had a flat growth rate when it came to Slaughter Points. They usually cost one point to go from Entry to Advanced, then added a point on top of the initial cost until Perfection.
Yet, the Li Family Spear Technique cost far more to perfect than a normal martial arts technique, which was something interesting to think about.
But for Li Ling, the interesting aspect was actually directly revealed to him the moment he attained Perfection. The Li Family Spear Technique he had practiced day and night since he was a prepubescent teen actually had a level of depth to it, because its advancements at each level gave birth to shocking effects.