The Hyakki Gokai is a hyper-stylized, ornate weapon featuring a complex, asymmetrical design with sharp, angular edges and intricate engravings that glow with a vibrant, luminous energy. Its surface is a combination of polished metal and translucent crystal, creating a striking contrast between the sleek, reflective finish and the ethereal, glowing core. The weapon's distinctive design elements include demonic motifs and flowing, organic patterns that seem to pulse with power, emphasizing its supernatural origin and formidable presence in battle.