C542 Experiment

After Ruan Xiude stepped into the Black Origin Tower, he found that it was pitch black inside, as if he had fallen into an endless abyss.

At this moment, a cold voice sounded.

"Challenger, please choose your opponent and battle venue!"

This voice was as if it was a machine, without a trace of emotion.

After that, rows of names appeared in front of Ruan Xiude