History of the Demise of Sects

How did the mighty sect Blood Knife Sect lead to destruction step by step? Is it the distortion of human nature or the loss of morality? Or was it destroyed by a more powerful sect? Still... I can't continue editing. Why does the introduction need to be at least a hundred words? I really don't know how to make an introduction! Just a few more words and that's enough. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.