Create a high- definition, detailed full- body concept art of a fuchsia- skinned, long, limb- mutated nightmare skeleton character, inspired by Phyllis Bone and the movie Alita. The character stands still in a dark, eerie forest with UFO aliens visible in the background, reminiscent of a Blu- ray image. The atmosphere should be foreboding, with detailed shadows and a sense of tension. The style should be similar to concept art, with a smooth and detailed render suitable for Unreal Engine 5