When Lin Zhen awoke with his spiritual power, he was at the Late Bronze Stage.
After taking the Genetic Potion, his spiritual power grew, but only to the Silver Early Stage, close to its peak.
Later, he practiced his spiritual power daily without interruption, reaching the Early Stage peak, allowing him to control three flying knives.
He made five flying knives, wanting to control four, but the Early Stage peak wasn't enough. He needed to enter the Middle Stage, but practicing spiritual power wasn't that easy. It required steady progress over time, and only through life-or-death experiences could he make rapid advances.
This time, it was a true life-or-death situation, and with the outcome depending on spiritual power, Lin Zhen's mental power finally had a leap in growth.
If prior to this his Silverized spiritual power was at 33%, it was now at 55%.
An increase of more than twenty percent!