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It states in the wiki that his sword can ignore durability against evil opponents but this is not correct. The sword was imbued with the human spirit itself and thus is able to harm Aku who is pure evil. The sword was specifically made to be able to harm him and cannot hurt innocents. Aku is essentially just a culmination of evil, sentient goo that can change forms. He is immune to normal weapons because of this. It's a resistance property, not a durability. The sword bypasses this resistance.
Proof that the sword cannot just bypass durability of evil beings is when Jack fights the ultra Aku robots. Each one was made of a very strong alloy and the sword was not able to cut through it until Jack got a massive AP boost that exceeded the durability threshold. The robots were powered by Aku's evil essence and thus would have counted as evil beings, but the sword could not cut through them with Jack's base strength level.
Proof that the sword cannot just bypass durability of evil beings is when Jack fights the ultra Aku robots. Each one was made of a very strong alloy and the sword was not able to cut through it until Jack got a massive AP boost that exceeded the durability threshold. The robots were powered by Aku's evil essence and thus would have counted as evil beings, but the sword could not cut through them with Jack's base strength level.