Maliketh's black blade which once harbored the power of the Rune of Death. A sad shadow of its former glory. After a fragment of Death was stolen on that fateful night, Maliketh bound the blade ...

it could become a Supreme Grade if Zoro uses Armament Haki to turn the blade black (it would be pretty cool if he did, Oda!). After Yubashiri’s demise, Zoro found his next sword on Thriller Bark ...