C356 A Business Genius!

Two days later, Feng Yixiu had successfully upgraded all of the Iron Demon Spiritual Cards to Bronze Class.

"Working with these Fusion Demon Spiritual Cards is even more exhausting than training!" Feng Yixiu mopped his brow, looking with pride at the over 500 Bronze Demon Spiritual Cards beside him.

"Still, fusing these cards seems to be quite beneficial for my cultivation