Fantasy troll in a lush forest, photorealistic detail, rendered with octane's power, utilizing the depth of Unreal Engine, hyper detailed textures capturing every wrinkle and patch of skin, vibrant HDR lighting casting dynamic shadows, set against towering ancient trees and a carpet of moss. The troll's eyes glimmer with mischief and secrets, while its gnarled hands clutch a rustic wooden club adorned with mystical runes. The atmosphere is alive with the rustle of leaves and distant bird calls, creating an immersive scene in a narrow trail meandering through the dense woodland.