The Hyakki Gokai is a hyper-stylized, ornate weapon with a curved, asymmetrical blade that glows with a vibrant, luminous energy. Its surface is highly detailed, featuring intricate engravings of mythical creatures and patterns that seem to pulse with an inner light. The handle is wrapped in dark leather, contrasting with the bright, metallic sheen of the blade, and the guard is designed to resemble demonic faces, adding to its menacing appearance.