Relin showed a grand stance and a mighty aura as he uttered those words before turning to the castle's exit. "It would be easier to teach you in a place where we don't have to worry about collateral damage. Follow me."
Cain nodded to the old man, and they both left the castle before rising to the sky and flashing away from the fortress.
It did not take long for Cain and Rellin to reach a desolate forest far from any populated center. A solemn expression appeared on the old man's face as a scholarly aura arose from his eyes, prompting a similar sharpness and focus to rise in Cain's eyes as he understood that the lesson was about to start.
Rellin wasted no time in delving into the heart of the matter. "The Level System, the primary strength system of the human race and nearly all races in the Crimson World, is a crucial element of our existence. Its key lies in the energy pool, a unique dimension nestled within your brain."