As his skin rose and fell like waves, Li Yan's bones let out a series of overloaded "crack crack crack..." sounds, as though they might snap at any moment.
Sweat poured from Li Yan like rain, while the excruciating pain within his body relentlessly assailed his nerves. Yet Li Yan seemed not to feel it at all.
He had already endured this sort of agony countless times. Whether cultivating the "Qiongqi Purgatory Art" or refining essence blood, both were inhuman processes of purgatory.
It was only that Li Yan felt the pain now was far lighter than before, and his endurance seemed to be growing ever stronger...
Another half hour passed. Amid the dense, rain-like crackling of Li Yan's bones, the sounds suddenly converged into one. Like muffled thunder, it exploded within Li Yan's body, causing the entire cultivation chamber to shake violently!
Li Yan stood bare-chested in the cultivation chamber. Feeling the strength within him, which had not increased for so long, he could not help clenching his fists.
The instant he clenched them, the pads of all ten fingers swelled with an incomparably full sensation. This was the solid, satisfying feeling brought by a sudden surge of strength.
"In just half a day, I broke through to the fourth layer, and my cultivation level rose a little as well. Very good!"
With delight on his face, Li Yan muttered to himself.
In half a day, the "Qiongqi Purgatory Art" had broken through to the fourth layer, while the bottleneck of the middle Nascent Soul stage had unexpectedly loosened by a trace.
Although he was still far from the peak of the middle Nascent Soul stage, being able to improve at all at this level—even by the slightest bit—was something one could only hope for, not seek.
Li Yan