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 blade transitions from a dark metallic base at the hilt to a bright, almost translucent tip. The hilt is wrapped in patterned leather, providing a secure grip, and the guard is decorated with embossed symbols that pulse with energy when wielded.