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Becoming one of the Nine Great Experts is not an easy task. Many of the positions have long been determined, such as Yi Luo Xiang, Yan Qingying, Ming Xuan, Po Kong... These are unshakeable. Even Xin Yun doesn't know if he can become one of them, not to mention Ke Zhan.
Therefore, after much deliberation, Xin Yun fashioned Ke Zhan into a mobile artillery platform, and a terrifyingly powerful one at that—comparable to the Katyusha Rocket Launcher. Even if he couldn't become one of the Nine Great Experts, when it comes to attack, destruction, and firepower alone, he arguably exceeds them! It's just that he falls short in other aspects.
