Apocalypse High Martial Arts: I Refine Source Energy with Gray Stones

They laughed at him as a good-for-nothing who had failed to break through for three years.

It wasn't until he drove a blade through the throat of a third-rank martial artist that anyone remembered:

A good-for-nothing would never secretly refine source energy in the woodshed.

In an apocalyptic era of advanced martial arts, under a red-fog apocalypse, Shen Jing rises from menial servant to the supreme master of martial arts with the help of a gray stone.