C149 The Ultimate Breathing Technique

[Note: The mysterious breathing technique has been deposited into the storage space. The host will automatically select one upon retrieval.]

Zhang Xuan chuckled upon hearing the system's voice echo in his mind.

"Brother Zhang, let's check out the spirit stone mine, shall we?" Shi Jun suggested with a grin.

"Sure!" Zhang Xuan was curious to see what spirit stones actually looked like