Song Yan's eyes fell on the mountain walls of this mountain range. The color of the mountain walls is black gold, not like rocks, but like a strange metal.

As his mind moved, he flexed his fingers and threw a thread of energy.

"Ding!"

A little spark splashed out, killing the innate nine-fold strength of the unexpectedly did not even shake a bit of stone powder.

For a moment, Song Yan's eyes suddenly opened round. How could the stone on the mountain wall be so hard? He was a little bit disbelieving in evil and tried his best to play a little vigor.

jingling, splashing sparks, the rocks are still...