Courtyard.
Gu Sheng was attempting to temper his bones. He appeared to stand motionless in the courtyard, but within him, the Qi Blood Power had already begun to surge violently. However, Gu Sheng was controlling it with extreme caution, letting the Qi Blood Power thread through his flesh and wrap around his bones.
"Mm!"
A muffled groan escaped as a wave of searing pain emanated from within. The sensation was far more intense than the pain of Refining Skin or Blood Refining.
It felt as if tiny nails were being hammered into his bones, constantly twisting; it was akin to unprotected flesh being plunged into scalding oil.
Sweat dripped from Gu Sheng's forehead, and his body couldn't help but tremble slightly.
Bone Refining, as the name implied, involved using Qi Blood Power to shake the bones until their strength underwent a transformation, allowing them to better support the flesh and skin, resulting in an immense leap in power!
Sizzling sounds!