Generate a dark and eerie depiction of the infamous "Number of the Beast," 666, in a hauntingly symbolic and visually striking manner. Capture the essence of malevolence and foreboding by incorporating sinister elements and occult symbolism into the artwork. Let the composition exude a sense of otherworldly power and ancient mysticism, with cryptic runes, fiery brimstone, and shadowy figures lurking in the background. The number 666 should be prominently featured, shrouded in an aura of darkness and mystery, evoking a chilling sense of dread and unease. Embrace the darkness and unleash your creativity to craft a masterpiece that embodies the sinister allure of this infamous number.