Macro close-up of an antique obsidian chess knight piece suspended in infinite void, flowing liquid chrome mercury with iridescent oil-on-water rainbow oxidation spreading across frozen metallic horse head and beveled base, razor-sharp sculptural contours catching prismatic rim light reflections, suspended copper and silver dust particles dancing in dramatic volumetric glow, deep charcoal background with scattered platinum fragments, hyperrealistic 8k render, volumetric lighting carving luminous vintage game piece edges from darkness