The Fourth Mark is a sleek, futuristic hand cannon with a dark, metallic finish and glowing cyan accents that pulse with energy. Its design features a long barrel with angular, geometric cuts and a compact grip wrapped in a textured, ergonomic material for enhanced handling. The weapon's surface is adorned with intricate, glowing runes that suggest a deep connection to the Darkness, adding a mystical and ominous aura to its high-tech appearance.