Xu Yi glanced at Lu Wuji and said, "Brother Lu, rest assured. Before I've put you both at ease, I won't ask for a single treasure."
Lu Wuji smiled faintly. "The Immortal Envoy is too kind. May I ask how many you need?"
Xu Yi said, "I've studied this sort of crystal core. It's rich in Immortal Spirit Power, but it doesn't catch my eye. As far as I know, there are two kinds. There's another kind that's a little more mottled in color, with a faint halo around it, and it feels cool to the touch."
As soon as he finished speaking, Lu Wuji and Su Jiewu exchanged a glance. Su Jiewu sent him a thought: "Brother Lu, that settles it. He really is from the Immortal Realm. Otherwise, there's no way he could have seen the strange crystal cores gathered in our formation."
The two had spent so long at the Barren Frontier, and had collected quite a few crystal cores through the General Chamber of Commerce, but not a single strange crystal core.
After testing them again and again, they had confirmed that these strange crystal cores only appeared when a crystal beast manifested them itself.
Without the formation diagrams of the Void Hall, it was almost impossible for a crystal beast to manifest.
At least, it was absolutely impossible at the Barren Frontier.
Aside from them and Xue Kuangye, no one could possibly know about the strange crystal cores here.
And even they couldn't have known about the cool sensation of those cores, since the cores were inside the formation, where they couldn't touch them.
Lu Wuji didn't have time to answer Su Jiewu. He smiled at Xu Yi and said, "The Immortal Envoy is indeed widely learned. I admire you. To be honest, my brother