For a while, Shang just kept experimenting with Death Mana, but at some point, he just kept lying on the ground as a half-dead husk.
Lucin became a bit concerned, but he could feel that Shang was still alive.
For several years, Shang just lay on the ground, half-dead.
Lucin felt more and more awkward and strange.
Eventually, he asked Shang if everything was okay, and Shang just answered that everything was fine.
Yet, Shang just kept lying there, doing nothing.
Naturally, Shang wasn't actually doing nothing.
In truth, Shang was fighting against beasts and Mages inside his inner world, and he kept his real body half-dead so that he could experiment with more Death Mana inside his inner world.
His real body had essentially transformed into a Death Mana generator.