One Piece: What Is the Seastone & What Does It Do?

One Piece: What Is the Seastone & What Does It Do?

There are many intriguing concepts in the world of One Piece. We cannot even begin to fully address all of them, and new ones keep appearing. In this article, we will talk about Devil Fruits, but from a completely opposite perspective, as we will talk about a rare yet naturally occurring mineral that completely annuls Devil Fruit powers. In this article, you will find out what the Seastone is and what it can do.

The Seastone is a natural mineral that appears in the world of One Piece. It is completely normal in nature, but it is also immensely rare. Literally, it is a stone that can be shaped and made into various objects, but its main purpose is to completely annul the effects of a Devil Fruit. It is most common in Wano Country, where it appears naturally, but it is currently present worldwide and is used by many, especially the World Government, as its scientist, Dr. Vegapunk, has done the most extensive research on the Seastone that we have. It is highly dangerous for Devil Fruit users, as it can render them completely useless in battle, but its effects last only while it is in contact with the Devil Fruit user.

The rest of this article will, of course, explain the history of the Seastone in One Piece. We don’t usually have the opportunity to write about objects from the lore, so this is a welcome refreshment in terms of our usual articles. The Seastone is rare but extremely potent, and since many of the series’s main characters have some Devil Fruit powers, the Seastone’s importance cannot be understated. Of course, the article will contain a certain amount of spoilers, so be careful how you approach it.

The Seastone is an important part of the lore, and it is exceptionally dangerous to Devil Fruit users

So, as you all probably know by now, Devil Fruits are one of the most intriguing aspects of the One Piece lore. These rare, one-of-a-kind fruits can give a person who eats them some amazing powers. Depending on the fruit, they can give you the following powers.

They can give you the ability to transform, make your body stronger, etc. Be that as it may, they are both interesting and extremely powerful, which is why many characters with Devil Fruits are among the strongest in the series.

Although a Devil Fruit is not necessarily proof of one’s strength and extreme power, no one really wants to face a Devil Fruit user, especially on land. Sure, on the sea, since the Devil Fruits take away one’s ability to swim and they basically make them weak to seawater, but you cannot always keep someone in sea water, can you?

Luckily for those who face Devil Fruit users, a completely naturally-occurring mineral enables non-users to fight against Devil Fruit users on equal terms, as that mineral completely annuls a Devil Fruit’s powers and abilities. It is the Seastone, and in this article, we are going to tell you all about it.


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Seastone is a very rare stone present in nature only in some areas. It is a mysterious material that releases the energy of the sea as if it were solidified. It is as hard as a diamond and, therefore, cannot be easily destroyed, so much so that it is considered virtually indestructible. To demonstrate this, a Bananawani broke its teeth trying to bite a Seastone cage, and not even the powers of the Ito Ito no Mi were effective.

Pyrobloin is an element contained in Seastone, as well as in the magma of some volcanic sites, which is erupted into the sky in the form of dust, which determines, depending on the percentage in which it is present in the clouds, the formation of seas of clouds and islands of clouds. Furthermore, it is also probably the cause of why the flora and fauna of the Upper Yard has grown larger over time.

Seastone weapons are effective at immobilizing devil fruit holders. If placed in direct contact with someone who has eaten a Devil Fruit, the mineral absorbs the energy of the victim’s body and takes away control over the acquired power, obtaining the same effect as if it were thrown into the sea, also preventing him from using Haki.

The level of weakness induced depends on the density of the material and the extent of the contact surface; for example, Seastone handcuffs take away people’s powers but allow them to stand up and walk normally, although they weaken them considerably from a physical point of view. Proof that the Seastone only works with direct and constant contact is given by the fact that Smoker is able to carry his jitte with him without it weakening him since only the tip of the stick is made of that stone.

Although Devil Fruit powers do not work while in contact with Seastone, some effects can still work on it. For example, a key made with Galdino wax can open a pair of Seastone handcuffs. However, even with the powers of devil fruits, Seastone has never been seen to break. Seastone also acts on marine creatures such as the Kings of the Sea: by coating the keels of ships with it, the creatures found under the boats do not notice their passage and, therefore, ignore them.


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And this is the story of the Seastone in One Piece. As you can see, this is an exceptionally important element of the lore, and it can be used as a very interesting and powerful weapon. Even the most powerful Devil Fruit users can be subdued with this, so there is a possibility that this is going to be even more important in the future.

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