Aside from special Life Skills, the common Life Skills were not so difficult to learn. Rather, the difficult part was upgrading them to the next level.
Similarly, Army Attack Tactics was not that difficult to learn as well. Most iron-level hunters were able to complete the first level within three days.
Lin Huang was taught by a specially appointed person that specialized in the Army Attack Tactics practicing crystal. Lin Huang could now gradually divide his Life Power into parts.
The Life Power which initially resembled a clear stream started to divide into two streams, the two streams then divided into three streams, three streams began dividing into four and eventually, his Life Power was divided into 12 streams after he completed refining his Life Power. It was akin to a large military unit that was broken into 12 smaller units.