When Limit Breaker reached level three hundred, Rain felt like something inside him was changing… the feeling intensified when Apex Fury reached level one hundred. Those skills were basic ones, so they required normal amounts of experience to level up, so Rain felt awesome with that feeling inside him growing.
It was a sense of power, vigor, and freedom… he assumed that those kinds of skills were affecting him more because of their nature. Those skills were part of the berserker king and berserker emperor's path, and there were few things more freeing than the actions of a mad warrior.
"I guess this isn't unexpected," Rain thought. "Some paths develop faster than the others because we are more talented in some fields, like a certain type of elemental magic. Since I am always moving my body and those techniques improve my fighting style, it makes sense that they would affect me like this."