Fortunately, this wasn't Zheng Zetian's first time crossing the Beichen Sword Formation at the Starry Sky Sword Tomb. Chen Sha's sword heart and comprehension were indeed lacking; the formation was set up by the book, exactly according to the formation diagram, without any change. One couldn't see a trace of her own innovation and attempt, which wasn't surprising that she had been stuck at this step for many years.
With just a single circuit, Zheng Zetian saw through the foundation, so he broke into the formation. Naturally, he did not trigger the sword formation's sword light throughout, as if the forest of broken swords and the piercing sword edges around him were all but illusions. He casually strolled into the core of the formation.