Two strong practitioners possessed abilities on Emperor's Throne fighting with spells. The spells and divine arts used were boundless and straightforward as their offense and defense had the principles of the Great Dao is the simplest and the easiest. There weren't many transformations needed in the divine art to unleash a power that countless divine arts practitioners and gods couldn't reach.
It was the divine art of the realm of the path—simple, effective, and no unnecessary transformation. Qin Mu's Opening Calamity Sword was the symbol of his sword skill entering the path.
However, Qin Mu had only comprehended one move, and after he executed it, no other sword skill could follow up. On the other hand, it was extremely simple for Goddess of Heavenly Yin and Son of Heaven Yin. Even though they were fighting across worlds, their attacks were brilliant and varied, and there was rarely a repeated move.