The figure enshrouded in black qi remained silent as he pulled out a pair of stone boxes that he placed down onto the auction platform, and with a sweep of his sleeve, the lids of both of the boxes flew off at once to reveal a semi-transparent purple crystal and a rather strange-looking ball of black mud.

The crystal was around the size of a human fist, and its surface was riddled with pits and bums, as well as overlapping purple lightning veins.

These lightning veins were constantly flashing with purple lightning, as if they were lightning captured in solid form, and they were giving off a violent lightning aura.

As for the ball of black mud, it appeared to have been rather unremarkable at first glance, but upon closer inspection, one would notice that it was giving off a layer of extremely faint black light that seemed to be able to devour all surrounding light, giving it a very mysterious appearance.

"I'm exchanging this Lightning Soul Crystal for a lightning-attribute immortal treasure or 300 Immortal Origin Stones, and this ball of High Zenith Yin Mud for a 100,000-year-old Yin Dragon Ginseng," the figure declared.

A wry smile appeared on Han Li's face...