Lan Xuanyu ultimately didn't ask why he had to undergo such painful cultivation of Annihilation Thunder. In front of his father, he didn't want to show weakness, nor did he want his father to think less of him. He kept biting down and persevering, repeatedly breaking through the verge of collapse. He released the Annihilation Divine Thunder time and again.
Gradually, Lan Xuanyu began to feel the changes within himself. To his surprise, in the process of repeatedly using the Annihilation Divine Thunder, he not only became familiar with his increased strength, but more importantly, he felt his entire body transforming.
When he first broke through, although he felt powerful, as if he had undergone a rebirth, at that time, he seemed to be floating in the air. The sudden enhancement of strength was tremendous, but it felt somewhat illusory.