The Hyakki Gokou is a hyper-stylized, ornate katana with a blade that appears to be forged from a dark, almost supernatural metal, emitting a faint, eerie glow. Its hilt is wrapped in crimson fabric, intricately tied with golden threads, and the guard is designed in the shape of demonic faces, adding to its menacing aura. The blade features subtle engravings of mythical creatures along its length, enhancing its mystical and legendary status.