Have your tree Yule Ball ready or show your love for Harry Potter with Nemesis Now's range of Harry Potter hanging decorations. Here we have the Dark Mark, immortalised in resin and ready to hang in your home. The Dark Mark is the symbol of Lord Voldemort and his Death Eaters. It refers both to a magically induced mark that every Death Eater bears on his or her inner left forearm, and to the same symbol summoned in the sky by the spell Morsmordre. The Dark Mark is the symbol of Lord Voldemort and his Death Eaters. It refers both to a magically induced mark that every Death Eater bears on his or her inner left forearm, and to the same symbol summoned in the sky by the spell Morsmordre.