The choice was not easy to make though. One path led to increased combat strength and the other led to increased survivability against a specific type of enemy that was prevalent in this zone. In the end, Li Ling decided to go on a small-scale slaughter when he encountered a nearby cultivation society to replenish his Slaughter Points.
As such, he made the rather questionable decision to invest in the Essence Locking Technique right now. The reasoning was mostly that there was not as much of an overall objective gain by going from Mortal Flesh level 8 to level 9 and Falling Boulder Art from Mastery to Perfection compared to locking in his yang.
As such, he spent a cumulative total of 45 Slaughter Points to bring it to Perfection. Immediately, Li Ling felt the insights wash over him and, like with most techniques he perfected, it was not just insights but actual physical changes to his body to make him transform from someone who had never practiced it to someone who perfected it.