The Hyakki Gokai is a hyper-stylized, ornate weapon with a curved, asymmetrical blade that glows with a vibrant, luminous energy. Its surface features intricate engravings of mythical creatures, and the handle is wrapped in dark, textured leather for a secure grip. The blade's material appears to be a fusion of polished metal and crystal, giving it a reflective, iridescent finish that shifts colors under light.