Create 4K PBR textures for a fantasy ice blade knife. Materials: translucent frozen crystal blade with internal fractures, frosted ice surface, silver metallic guard, white leather wrapping, cold glowing runes. Export Albedo, Roughness, Metalness, Normal, AO, and Height maps. Emphasize icy refraction, frost buildup, micro-cracks, cold-tone reflections, mystical glow accents.