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This book is also called "A person in the Demon Sect, who has been undercover for several years and has become a demon" ------------------ (Single female protagonist, no system, dark martial arts) ------------------ Killing and tempering the sword, the heaven and the earth will kill each other, Break the endless road. The bones are used as a boat, and the sea of blood is used as a ferry. The rivers and lakes are all dry. ... For fifteen years, I have been practicing chess. Overnight, I cut off my return. ... Heard Over the years, he has had so many weapons that he has polished with his own hands to use, so much so that he has long forgotten the feeling of holding a sword himself...