Mark of the Shadows - [Render]

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A Mark of the Shadows (known as a "Dark Mark" in the Japanese version) is a mark appearing on a Dark Signer's arm, though with the exception of Rex Goodwin's Condor Mark that appeared on his back.  Each mark corresponds to one of the seven Earthbound Immortals. Having the dark mark allows the Dark Signer to use the corresponding Earthbound Immortal as a card.

more info: yugioh.wikia.com/wiki/Mark_of_…