What was the most crucial thing for a power system? The answer greatly depended on the type of person faced with this question.
Some would claim that energy itself was the cornerstone of all power systems. The more energy a practitioner could absorb, the more powerful they would be.
Other people might give different answers.
The need for gaining an understanding of the world and the laws that govern it, the constant unleashing of their potential, and many other factors.
Yet, no matter which power system one chose to practice, they would have to go through similar stages.
For example, Devils mostly relied on the devouring of dead souls to progress while they were in their weak phase.
As they got increasingly more powerful, they had to master their abilities, comprehend abstract concepts, and achieve multiple life leaps.
The other power systems that Liora had encountered were roughly the same.
