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The Dark Dragon Blade (魔刀 「黒龍丸」, Matou "Kokuryuumaru"?, Devil Sword, Dark Dragon) is a dark and ancient sword made from the bones of the Dark Dragon, it is the main catalyst of events set in Ninja Gaiden. After the Dark Dragon was slain by the Dragon Lineage, the Fiends set out to create a sinister counterpart to their weapon, the Dragon Sword. Using the dragon god's bones, they forged the Dark Dragon Blade, which held the power of the Dark Dragon and the souls of his slain spawn, Black Dragon.

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