15-second ultra-cinematic dark fantasy transformation sequence in a remote forest during a thunderstorm at dusk. A lone human stands in a clearing surrounded by towering pine trees as rain falls steadily through the forest. Thunder rumbles overhead while wind moves through the branches. The person suddenly freezes as a powerful force surges through their body. Muscles expand visibly beneath soaked clothing. Their posture changes, becoming heavier and more animalistic. Fingers lengthen into powerful claws while hands gradually broaden into massive bear paws. The camera circles dynamically around the transformation as fur begins spreading across the arms, shoulders, chest, and face. Bones shift beneath the skin with realistic anatomical motion. The spine lengthens, shoulders widen dramatically, and the silhouette becomes increasingly bear-like. The transformation accelerates. Clothing stretches and tears naturally under the expanding physique. Thick dark fur grows rapidly while the face reshapes into a powerful bear muzzle. Breath becomes visible in the cold air. Lightning illuminates the scene as the creature rises to full height. Water sprays from its fur while massive muscles flex beneath the coat. The camera pushes in close to glowing eyes filled with primal intensity. Final cinematic moment: the fully transformed bear stands in the rain, towering above the forest floor. It lifts its head toward the stormy sky and releases a powerful roar as thunder echoes across the mountains. Style: ultra-cinematic realism, realistic transformation VFX, detailed fur simulation, grounded anatomy changes, dramatic storm atmosphere, realistic rain interaction, powerful creature presence, dynamic camera movement, AAA fantasy film quality, no text, no overlays. Audio: cinematic orchestral build with deep percussion and primal energy, combined with realistic rain, thunder, wind, heavy breathing, bone-shifting effects, fur movement, and forest ambience.