Dyna Stone

The Dyna Stones are weapons of mass destruction, considered as the Marines' trump card. Zephyr stole them at the beginning of One Piece Film: Z.

Appearance
The size of a rugby football with an oval shape, the Dyna Stones are stored within a thick metal case, which can then be opened to reveal a glass tube filled with light, transparent purple liquid and the stone itself. Gray in color, the stones have several large jagged marks which glow like magma.

They are stored within thick metal cases with transparent purple liquid, which is to prevent them from being exposed to oxygen that detonates them.

Abilities and Powers
Each of them have power said to rival the Ancient Weapons in terms of mass destruction, and as the Marines' trump card they are considered extremely valuable to them. Their power is testified by Zephyr's dream to destroy the New World with them, and by Kizaru when he seemed intimidated by simply one. They explode upon being exposed to oxygen, which results in a powerful explosion that can wipe out an entire island, in a manner similar to nuclear bombs. Due to their destructive potential, it is forbidden for the general public to be in possession of them; the Marines alone locked them up for that reason.

Purposes
The Dyna Stones were originally meant to be the Marines' trump card, weapons used to defend the three Endpoints (and by extension, the New World) from being destroyed. They were stored in a Marine base on the first of the Endpoints, Firs Island, behind high security.

Zephyr's Attack
After Zephyr left the Marines, he and his Neo Marines infiltrated Firs Island and stole the stones in order to use them to destroy the three Endpoints, so he could release a large quantity of subterranean magma to flush away the Great Age of Piracy, along with the world.

Right after the Neo Marines stole the stones from Firs Island's Marine Base, Borsalino engages in battle with Zephyr, who uses one of them to destroy the island, which was also one of the Endpoints. He later uses many stones to destroy the second Endpoint, Secon Island, then positions the weapons to wipe out the last one, Piriodo. However, the Straw Hat Pirates, and later the Marines, stop Zephyr from destroying it.

The remaining Dyna Stones' whereabouts after Zephyr's death and the Neo Marines' defeat remains unknown, though Kuzan froze the ones on Piriodo to prevent them from detonating.

Trivia

 * The Dyna Stones seems to have been reducted in power during the film. At the start of it, one of them is able to destroy a whole island, while at the end, they cause a way minor explosion.

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