[Create an original 9:16 vertical dark-fantasy action illustration featuring two adult heroes battling a gigantic six-legged mountain predator inside a collapsing medieval fortress. The male hero should be a rugged adult warrior with a strong masculine build, medium-length messy dark hair, subtle facial hair, and dark medieval combat clothing. He stands in the lower-left foreground, desperately gripping his weapon with both hands and using it to hold back the monster’s enormous lower jaw, only moments away from being crushed. The female hero is an athletic adult warrior with warm medium-fair skin, amber-brown eyes, and long, thick, naturally wavy black hair reaching exactly to mid-back. She wears a charcoal-black medieval fantasy outfit with dark leather armor, dark boots, wrist guards, and a silver pendant containing a tiny crimson gemstone. She is climbing across the monster’s heavily armored shoulder, preparing to strike the vulnerable neck joint. Design the creature with believable biological anatomy: six powerful muscular legs, thick armored hide, a massive neck, broad functional jaws, large natural teeth, two heavy horns protecting its skull, a short muscular tail for balance, and deep-set glowing crimson eyes. Avoid tentacles, extra limbs, humanoid anatomy, or random anatomical structures. The monster has smashed through the fortress wall, with its enormous head already inside the battlefield only a few meters from the heroes. Its front legs are crushing stone structures beneath its immense weight. Make the scale overwhelming and communicate that both heroes are seconds away from death. Surround the scene with collapsing fortress walls, shattered towers, falling masonry, flames, smoke, heavy rain, flying debris, and dramatic crimson lightning cutting through the storm clouds. Use an extreme close, low-angle camera position from ground level. The monster should dominate most of the frame, with the male hero in the foreground-left and the female hero positioned higher in the background. Use a strong diagonal composition with intense depth, motion, and scale. Art direction: premium hand-painted 2D dark-fantasy artwork, rich painterly brushwork, detailed anatomy, dramatic cinematic lighting, atmospheric depth, dynamic action, epic theatrical-poster composition, highly detailed environmental textures. Strictly 2D painted artwork. No 3D CGI, no photorealism, no anime, no cartoon style, no text, no logo, no watermark.]