Generate an enigmatic portrait of a cloaked figure standing on a desolate moor

Generate an enigmatic portrait of a cloaked figure standing on a desolate moor. The figure's face is obscured by a deep hood, casting an aura of mystery. In the background, a stormy sky swirls with swirling clouds, casting an ominous glow upon the scene. The figure's cloak billows in the wind, revealing glimpses of intricate runes etched into its fabric.