Supreme Sword Sovereign of the Skies

[Transcendent Fantasy + Swordsmanship + Invincibility] Ning Xuan has a sword, and within it lives a white-robed woman with peerless swordsmanship. "Senior, is there an invincible sword technique in this world?" Ning Xuan looked at the woman in white. She picked up a bamboo stick and wrote on the ground: "There is no invincible sword technique, only an invincible sword heart!" "Senior, can I learn it?" "No." "Why not?" "Because you were born with it!"