The Hyakki Gokai is a hyper-stylized, ornate weapon with a blend of traditional Japanese and fantastical elements. It features a curved, asymmetrical blade with intricate engravings depicting mythical creatures, set against a vibrant, glowing core that pulses with energy. The handle is wrapped in dark leather with golden accents, contrasting with the polished, metallic finish of the blade, which has a slightly iridescent sheen under light.