Katra

The elves were once an extremely violent and emotional race that were easily consumed and corrupted by anger, fear, sadness and joy. Within the ancient text, it was believed that the ancient elves had even reached a point where their violent nature threatened the universe and would lead to the extinction of their own species.

In the effort to avoid this disastrous fate, the ancient elves decided to develop a cultivation method that would allow them to be able to control their emotions and channel it into a newfound source of strength instead of being consumed by it.

This was the origin of the creation of Katra, which was the culmination of the wisdom of many elven ancestors.

Each elf would be taught the way of the Katra from an early age. 

As times passed on and eons fleeted through, Katra gradually became the foundation for almost all of the elven teachings.