His Golden Light is definitely enough to be lethal to the soul of the Fox Spirit; it just lacked a means to be used actively. Now it seems that means have been completed! Not only completed but also very flexible.
Previously, when facing the soul of the Fox Spirit, as long as the opponent did not actively collide with him, he could do nothing to the opponent. But now, if he enchants a long sword, or encants a stick at will and swings it, the originally intangible and untouchable soul of the Fox Spirit would certainly suffer damage once struck by his stick.