Xu Qing sat cross-legged, his body trembling slightly. If someone were close to him, they would inevitably hear a lingering resonance similar to the after-chime of an evening bell.
Under such a faint trembling sound, Xu Qing could clearly feel his whole body warming up as if his bones were becoming tender and numb.
This was due to his First Rank Tiger and Leopard Thunder Sound, which was purifying the impurities in his blood, and under the influence of this trembling sound, his bones were further developing and becoming even tougher.
After a long time, Xu Qing exhaled a breath.
"If I hadn't encountered the Tiger and Leopard Thunder Sound, my cultivation of the Tiger Demon Bone Refining Fist would hardly progress further."
Xu Qing knew that his bones, compared to ordinary people, could be considered as refined as iron.
But with the enhancement of the Tiger and Leopard Thunder Sound, they were gradually transforming into something as strong as steel.
