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This book is also called "I am in the Demon Cult, I have been undercover for several years and I have become a demon" ------------------ (Single female protagonist, no system, dark martial arts) ------------------ Killing creatures and tempering swords, killing both heaven and earth, breaking the endless road. Bones are used as boats, seas of blood are used as crossings, and rivers and lakes are filled with withered blades. ... For fifteen years, I have practiced chess with a flip of my hands. Overnight, I cut off my return. ... I heard that over the years, he has 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...