Brand a living thing once, and everything you throw will hunt it forever. This Paramecia belongs to Vander Decken IX, who leads the Flying Pirates, and it guides any hurled object toward its mark, from a single axe to a warship, which is why he calls it a curse.
A Paramecia-type Devil Fruit, this power fixes a chosen mark and then permits a strike on it from any range at any instant using whatever the user cares to throw. Vander Decken IX, who captains the Flying Pirates, is its holder. Since he speaks of the ability as a curse, people also refer to it as the Mato Mato Curse; the word at its root is the Japanese term for a mark or target.
Contact from one of the wielder's hands stamps a person as a target, and Decken can carry a mark for each hand he owns, meaning two. A stamped victim can then be hit from any spot even when the user has no idea where they are, because a thrown object bends its course to chase them and will even loop back like a boomerang should the mark come close. Bulk poses no problem, since Decken sent the enormous ship Noah hurtling at Shirahoshi merely by touching it, and thrown things keep their pursuit underwater too. The limitations bite hard, though. Only the living may be branded, never an object, the flight path cannot be steered once released, a strong enough barrier blocks and cancels the effect, and both a target's death and the user losing consciousness end the chase. A branded hand has to steer clear of touching anyone else, often sheathed in a glove, and seawater still saps the wielder.
For ten years Vander Decken IX hurled projectiles at Princess Shirahoshi from a distance, meaning either to coerce her into marriage or to end her life, which is exactly why she was shut away inside the Hard-Shell Tower to soak up the barrage. With his right hand pinned to Shirahoshi's mark, only his left could take on new targets. He flung heavy axes, knives, and even mobs of his own pirates her way, and turned the power into a locator by riding a branded slab of coral to her hiding spot. He grasped that she was alive only because the projectiles kept flying, since the ability dies alongside its target. Hody Jones later abused the fire-and-forget nature of the throws, wedging Decken himself into the path of an oncoming axe.

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The Mato Mato no Mi is a Paramecia Devil Fruit that fixes a chosen mark on a target and lets its user hit them from any range or instant with whatever they throw. Vander Decken IX, captain of the Flying Pirates, is the one who ate it and calls the power a curse.
Vander Decken IX, the captain of the Flying Pirates, is the user of the Mato Mato no Mi.
The Mato Mato no Mi marks a target when the user touches them with a hand, and Vander Decken IX can hold one mark per hand, for a maximum of two at a time. Once marked, a thrown object will bend its course to chase that person down, even underwater or across long distances.
The Mato Mato no Mi can only mark living beings, never objects, and its trajectory cannot be redirected once a projectile is thrown. A strong enough barrier can block and cancel the effect, and the chase ends if the target dies or the user loses consciousness.
Vander Decken IX used the Mato Mato no Mi to hurl projectiles at Princess Shirahoshi for ten years, either to force her into marriage or to kill her, which is why she was shut away in the Hard-Shell Tower to absorb the barrage.
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