. . "Mysterious Mask is a Character card appearing in the Deck Building Game's \"Nightmare\" expansion."@en . . . . "CH-040"@en . . "Mysterious Mask is a Character card appearing in the Deck Building Game's \"Nightmare\" expansion."@en . . . . "\"Nightmare\""@en . "Character"@en . "Mysterious Mask"@en . "Mysterious Mask (CH-040)"@en .