Dark mist-shrouded fjord troll emerging from iridescent glacial ice, photorealistic texture, intricately rendered with Octane and UnREAL Engine's advanced global illumination, 9:16 aspect ratio suits the troll's elongated, pale blue and purple skin with intricate swirling patterns, its eyes glow bright gold in HDR, while the surrounding icebergs shimmer with a subtle, soft blue light, hinting at the mystical and foreboding environment.