C1394 The Most Difficult Enemy

"Rumble …"

In the air above the Underground Palace, yin auras, lightning, and blue flames interweaved together. Flames continuously exploded in midair, shaking the entire Underground Palace to the point that it was slightly trembling.

"What a sight." Looking at the auras around Ye Kai, who were constantly exploding and filling up the surrounding space, Machinery Saint Lear revealed a wry smile