The Hyakki Gokoku is a legendary, ornate katana with a hyper-stylized design, featuring a slightly curved, elongated blade that gleams with a metallic sheen. The hilt is wrapped in dark, patterned fabric, adorned with intricate golden engravings of mythical creatures, and the guard is a complex, asymmetrical design resembling swirling flames. The blade itself has a subtle glow, suggesting its supernatural origins, with a surface that appears both polished and lightly weathered, hinting at its ancient power.