Responses
spoiler
its his new sword he formed after making the contract with lieb
Spoiler
No, he got the sword by using it in the fight where yami got taken away. It seems like swords he uses with anti magic become part of his collection.
It'd be so cool if Asta collects many other swords and then just goes around swinging tons of anti magic swords at the enemy like erza does in fairy tail lolol
Spoiler alert!
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What do you mean, Demon Decapitator Katana?