Gray Family Sword: Gureken

weapon name: Gureken

description: Gureken is a katana. It has a green handle with two model red asian dragons intertwining around the handle all the way to the buttcap. The buttcap is a bronze head of a chinese lion. It has a silver blade collar and a long silver blade. The sharp edge of the blade is dark blackish-gray due to the seastone.

Spoiler:

 

It is the blade in the image

weapon special abilities: The edge of the blade is laced in seastone, so if the blade punctures a devil fruit user it nullfies the DF user's abilities.

history: It was crafted a long time ago, and gifted "by the Gods" to the Gray family clan. It is passed down to greatest living swordsman in the family at the time. The only time it was offered to a non Gray family member was when it was offered to a great pirate, who defended Token Island from an evil pirate that no one on the island could defeat. It has been used by many past wielders to defend the island.

One thing I am not quite some of what you meant is the "It drains more and more of the power after each cut." part. Do you mean that each time it connects it makes the enemy more unable to use his DF powers, or is this the standard seastone ability of negating the user's DF power upon, and as long as it lasts, contact?
Otherwise it's good to go, just specify me that so I know, as seastone doesn't work in a draining way, without actual continuous contact. Unless if I got it wrong, or if this sword has some other mechanic going on here.

It takes multiple hits to connect with the DF user to actually nullify the DF user's ability. It slowly weakens the DF user's powers and abilities after each cut.

Im sorry, but as demonstrated in the manga and anime, seastone only works in an specific way: mantaining contact with a devil fruit user. This nullifies the devil fruit abilities only as long as contact is made.

Okay, so as long as the blade has punctured and is remaining punctured inside the devil fruit user, their abilities are nullified.

Yes, for the seastone's effects to happen on a DF user's body, the seastone surface must remain in contact with the user. Taking away the seastone means they can freely use their abilities again, as Rodo-sama stated above.

As everything seems in order now,

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