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Imitations of the Seven Deadly Sins.
Bai Wu once possessed a knife that lost its power after being used dozens of times, which was also an imitation of the Seven Deadly Sins.
It had the ability to percentage-wise slash the life of living beings, which could be said to be so powerful that it was astonishing.
At that time, Bai Wu thought that if an imitation could be so powerful, the genuine article might be stronger but not by much.
After the knife had exhausted its number of uses, Bai Wu gave it to Wu Jiu. Though it no longer had the miraculous "blood-shaving" ability, the material of the weapon itself was far superior to many others.
As Evil Fallen's strength continued to increase, the weapon in Wu Jiu's hands, Evil Fallen Must Die, although it had undergone two stages of Spirit Possession and gained the ability to drain life, did not even compare in power for slaying Evil Fallen to that of the disabled imitation Seven Sins weapon.