When the Stars Are Dim, Please Allow Me to Shine a Kitchen Knife

I cut my father's heirloom sword in half. I used a kitchen knife. When my dad came back, he was furious and chased me down three streets. He said that the broken sword was the treasure inherited by the No. 1 Sect in the world. I said: Dad, what is the origin of this kitchen knife? He fell silent. Later I learned that the predecessor of this kitchen knife once split the stars with a sword. And its secret involves the Eight Mysterious Emperors, the three ancient beasts, and a prophecy about the dimming of the stars. My name is Chu Yunxuan. Now I just want to ask: Who the hell turned the artifact into a kitchen knife? !