Mortals, Successfully Advance the Xuantian Spirit-Slaying Sword at the Beginning!

After traveling through the mortal world and visiting the Yellow Maple Valley, Chen Feng, who had just successfully established a foundation, came up with an advance system in his mind. He could advance treasures through lifespan or completing tasks! Chen Feng: "I want to pre-pay the Palm Heaven Bottle!" [Advance system: predictable, mission: kill ancient or modern people, and become the supreme in the fairy world]! Chen Feng: "..."