C574 Lau Yiyi Who Could Not Use It

"If you guide it correctly, this stone can enhance a person's mental strength."

Lau Yiyi paused suddenly, her eyes sparkling as she turned to Ye Feng with a grin.

"By the way, you're not familiar with mental strength, are you?"

"I stumbled upon it in an ancient text. Are you curious about what spiritual energy is?"

"Well, you'll have to ask me nicely. I'm in a good mood today