Back then, in the Immortal Forbidden Land, Old Master Seventh had brought the captain and Xu Qing to an Immortal Arts Hall. He took down two of the many human skin masks inside and gave them to Xu Qing and Erniu.
These two human skin masks were both immortal arts.
One was called the Heavenly Dog, and because it matched Erniu's habits, it was given to him.
The other one wasn't suitable for Xu Qing to use but Xu Qing thought that he could exploit it with the head, so he kept it.
This art was called compassion.
Its function was simple and singular: those who wore this human skin mask would bear the damage on behalf of the target they observed.
Xu Qing's original thought was to let the head wear the mask and let it share the damage when he was facing a life-and-death crisis.
However, Xu Qing hadn't encountered a time when he needed to use it.
Until now.