A striking fantasy troll depicted in a photorealistic style with incredible detail, enhanced by octane render and powered by Unreal Engine's capabilities, features hyper-detailed textures and vivid HDR lighting. The troll stands majestically with its rough, stone-like skin glistening under an ethereal glow, its massive, gnarled hands gently clasping a mystical staff adorned with glowing runes. Set against a dramatic twilight landscape with towering ancient forests and mist-covered mountains stretching into the background, the aspect ratio is tall and elegant at 9:16, capturing the grandiosity and mystique of this fantastical figure.