In his previous life, Wei Shengyang tried to kill a god, and ultimately died with Rong Yingshuang.
The resurrected Demon Lord gained the power of sacrifice and returned through time.
At that moment, the villain who had summoned him to the mortal realm gently stroked his face. "Wei Shengyang, you are my most perfect creation."
Wei Shengyang drained his soul on the spot.
A white-robed deity with snow-white hair came at the righteous sects' behest, sword in hand, to slay evil.
Instead, he saw a beautiful figure in black robes and red brocade elegantly wipe away the blood, then cut away a strand of Rong Yingshuang's hair with a single sword stroke. "Long time no see."
Within the world-ending barrier, the Demon Lord's sword was still dripping with blood.
He walked toward the deity step by step, his sword shaking the ages and a single thought swaying life and death.
Wei Shengyang's blade severed the deity's laws.
The Demon Lord succeeded in killing the god, but did not bring order to a new world. He stole the last of the deity's power, went into hiding among his many enemies in the mortal realm, and prepared to pull off one last big job before making his escape.
His escape plan went smoothly, and so did the sacrifice.
The Demon Lord played an elegy unchanged for a thousand years. His soul grew weaker and weaker as he soothed the resentment of the dead.
The desolate homeland was reborn, and spring returned to the land of the dead.
Just as the elegy was about to end, a faint halo shone through the eternal night.
The snow-haired, white-robed deity came walking beneath the moon and gently wiped the blood from the Demon Lord's face.
Theme: No one can be relied on unless you have something to offer. No matter how hard things get, you can only save yourself.