Dark Dragonstones

The Dark Dragon Stones

The Dark Dragonstones (黒龍石 Kokuryuuseki) are eight crystals that contain the will and spirit of the Dark Dragon itself. The stones were released upon the Dark Dragon's defeat at the hands of the Dragon Lineage. According to Muramasa, if all of them were collected in a single place, their sinister power would surpass that of even the Dark Dragon Blade.

History

Quoted directly from the game

The Dark Dragonstones. They are composed of crystals of immense evil energy released by the Dark Dragon at the moment of its defeat at the hands of the Dragon Lineage. It is said that even only one of the Dark Dragonstones contains a lot more than enough power to completely eradicated universes with their entire dimensions, and each one of those stones are able to bestow an enormous surge of malevolent power on those who possess them, but it's power won't be fully utilize nor controlled due to it's extremely unstable state and the one who tries to control them will end up being consumed as shown in Ninja Gaiden DS. Furthermore, if all eight Dark Dragonstones were to be collected in a single place, the entire existence would once again be enveloped in a chaos of death, and destruction, for the rebirth of the Dark Dragon, Such a fate has been foretold in the pages of the ancient chronicles.