The Demon Slayer Sword, as a divine weapon controlled by the Mysterious Heaven Region, was rarely used by Zhao Jiuling.
One reason was that Zhao Jiuling was not adept in the Sword Tao; even with the enhancement of a divine weapon, the power it offered was not significantly stronger than his use of Taoist secret techniques, after all, he was not a sword cultivator.
Another reason was that this divine weapon was forged from the life of an ancestor of the Taoist Sect. Although the effects of suppressing evil and slaying demons were stunning, every activation required the use of blood qi power. And while the consumption was not large, Zhao Jiuling still preferred not to use it often.
Now, facing Su Xin, the Demon Slayer Sword could truly exhibit its peak might.