Ji Ning's mental strength also entered the fifth level at this moment, and began to increase by leaps and bounds. In fact, during the battle of the Three Realms Catastrophe, Ji Ning finally understood the 'Heart Sword Heaven and Earth' and killed Old Man Yuan. Logically speaking, he should have entered the fifth level at that time. But because of the obsession and concern in his heart, he was stuck at the bottleneck....