Ou Yezi spent fifteen years working day and night to build the last sword in his life, Zichen. After the sword is completed, the sword body is like water rippling with purple light, and the blade has seven stars connected in a straight line like the Seven Stars Dragon Abyss. The seven stars on the blade have no luster. However, when Ou Yezi saw Zi Chen's birth, he felt panicked and uneasy. He watched the sky at night and saw seven stars coming together, and then he knew the reason. It turns out that Zi Chen will absorb the vicious energy of the Seven Stars and become a powerful Shura Sword.
At that time, the Chu State was about to attack the Song Dynasty, so it invited Gongshu Ban to build a ladder for attacking the city and a wooden kite for detecting intelligence. However, Gongshu Banjiu planned to attack the city, but Mozijiu refused. King Hui of Chu's patience gradually ran out, so he remembered the Tai'a sword, which had used the power of heaven to relieve the power of Chu, and wanted to use the power of the sword to attack the capital of the Song Dynasty. However, the Tai'a sword no longer appeared. King Chu Hui then remembered Ou Yezi, who had long been living in seclusion in Longyuan Valley, and asked his men to invite him out of the mountain to build another magical weapon that could sweep through thousands of armies effortlessly.