Xu Fengnian cut off his past life to get rid of the burden and implications of his previous life's identity. He chose to cut off the connection with his previous life and lost the ability to use the power of Zhenwu Great Emperor. However, he also got rid of the shackles of his previous life's identity. This allowed Xu Fengnian to pursue his own goals with his own strength and was no longer controlled by the immortals in the sky. The decision to cut off his previous identity made him lose the ability to use the power of Zhenwu Great Emperor, but it also meant that he could get rid of the connection of his previous identity, so that the future and luck of Beiliang would no longer be controlled by the Heavenly Dao. Although this decision had its pros and cons, Xu Fengnian had reversed his fate by doing so. He had escaped the fate of dying in the Battle of Liangmang that Huang Longshi had mentioned.
The reason why Xu Fengnian cut off his previous life was to get rid of fate, and to let the future and luck of Northern Liang get rid of the control of the Heavenly Dao. Cutting off his previous life meant that he had lost the ability to contact the Great Emperor Zhenwu, the Qin Emperor, and the Nameless Taoist. He could no longer ask their Dharmakayas to help him fight against powerful enemies. Although Xu Fengnian had increased his strength through hard work and gifts in the later stages, the decision to cut off his previous life had made his strength relatively weak. Cutting off his previous life's identity also allowed Xu Fengnian to get rid of the connection with his previous life in heaven, allowing him to face future challenges with his own strength.
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The reason Xu Fengnian cut off Zhen Wu was to get rid of the burden of his previous identity. He chose to cut off the connection with his previous life and lost the ability to use Zhenwu Great Emperor's power, but he also got rid of the shackles of his previous life's identity. This allowed Xu Fengnian to pursue his own goals with his own strength and was no longer controlled by the immortals in the sky. He didn't mention the specific reason for his decision.
Xu Fengnian's strength had weakened after he severed his previous life. Cutting off his previous life meant that he had lost the ability to contact the Great Emperor Zhenwu, the Qin Emperor, and the Nameless Taoist. He could no longer ask their Dharmakayas to help him fight against powerful enemies. Although Xu Fengnian had strengthened his physique as a celestial being through a series of hard work and gifts in the later stages and obtained a large amount of luck, in the battle with Tuoba Bodhisattva, a large part of his strength was still weakened. He could only rely on his boiling blood to turn into Qi to fight the enemy. Although he managed to defeat Tuoba Bodhisattva and Wang Xianzhi with the help of his accumulated luck and allies, his decision to sever his previous life made him relatively weak.
Xu Fengnian was the Great Emperor Zhenwu in his previous life. Zhenwu Great Emperor was Xu Fengnian's reincarnation.
In his previous life, Xu Fengnian was the Great Emperor Zhenwu, the Great Qin Emperor, and the Nameless Taoist. These identities from his previous life played an important role in his role and influence in this life. Xu Fengnian had obtained the essence of martial arts through his cultivation in his previous life and became the number one martial artist in the world. He could also break through the bottleneck of cultivation faster and reach a higher cultivation realm. These identities also helped him establish his prestige and status in the martial world. In addition to these identities in his previous life, Xu Fengnian's identity in this life was the heir of the Prince of Beiliang. He became the number one in the world through martial arts and successfully repelled the invasion of the Northern Mang. In short, the exposure of Xu Fengnian's identity in his previous life had brought him extraordinary cultivation realm and innate divine power in this life.
Xu Fengnian had severed his connection with his previous life in Sword Snow Stride. This action caused him to lose a trump card and sever his identity from his previous life. In this life, Xu Fengnian could only rely on his own strength to reach the invincible level of Ancestor Lu and Wang Xianzhi at their peak. He cut off the ties of his previous life to get rid of the burden of his previous life. From then on, there would only be Xu Fengnian, who guarded the Liang soil for his father. There would be no Zhenwu or the Qin Emperor in the world.
Maybe he wanted a new look or thought it was getting in the way of his work.
Well, there could be various factors. Maybe it was to gain a certain power or to escape a dangerous situation. Or it might be related to a psychological breakdown of the character.
It could be that cutting off his arm was part of a transformation or evolution for Aquaman's character. Maybe it was a symbolic act to show his determination and growth.