Vitality

Shen Fei's eyes brightened. "Is there a market for spirit crystals, Uncle Tao?" 

"Of course, but spirit crystals are too rare, and much too expensive for ordinary people to buy."

"The Shen family used to be quite rich. Back then, your family could afford two spirit crystals in a year." Tao Ming shook his head and sighed, his tone sounded envious.

The corner of Shen Fei's mouth twitched, and he could not help but ridicule, "You would empty our house for two crystals?"

"What do you know, kid?" Tao Ming glanced at Shen Fei. "These are crystals! A total of two! I don't think there are as many of these crystals in the Northern City!"

"Since it's so precious, why are there still people willing to spend money to buy it?"

"That's because spirit crystals are rich in spiritual Qi. For Beastmasters, they're definitely the best resources for cultivation," Tao Ming repeated.