Start with a Bloodthirsty Knife

After the death of the protagonist, he went to immortality and became a knife that can suck blood. Absorbing blood can enhance the strength of the knife wielder. The skill uses amplified energy to make the blade sharper and stronger. There is no need to identify the owner to strengthen whoever takes it. Instead of transforming into a human being, the plot of changing the knife holder with the knife handle possessed by the soul of another local strong man strengthens the protagonist. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.