The Immortal's Path-Shattering Melody

Inside a hidden realm, the heroine and the young master of the demonic sect fight to the death through dual cultivation: every position is a killing move, vital essences collide, and golden cores shatter. She refines away his life-giving yang essence, and both climb back onto the arena wounded. The young master collapses, gravely injured, and she finishes him with a single sword strike. His soul lamp goes out, and his father leads the clan to the border, sealing every escape with a palm strike. A sword light pierces the clouds, and the patriarch's hand is severed. The newcomer never appears, only saying: Consider this hand a warning.