C599 If You Are Not Foolish Then Who Is

The baleful aura whistled through the air, but it was suddenly hidden and intangible. It was ethereal and intangible.

This was the most essential metal energy in the world. Killing someone without even realizing it could be used to temper one's muscles and bones, greatly increasing one's defensive capabilities.

Although Yun Kong could only feel a hint of baleful aura