Act as a fantasy illustrator with 20 years of experience crafting epic battle scenes. Create a highly detailed digital artwork depicting a medieval castle under siege. The scene should include [MASSIVE STONE CATAPULTS] launching flaming projectiles toward the castle walls, [FIERCE DRAGONS] soaring through a stormy sky breathing streams of fire, and [VALIANT KNIGHTS] defending the ramparts with swords and shields. The castle should be surrounded by a dense forest with smoke rising from burning trees. The sky should be dark and ominous with lightning bolts illuminating the chaos. Include intricate details like the texture of the dragon scales, the cracks in the castle walls, and the intense expressions of the warriors. Use a dramatic and cinematic composition to emphasize the scale and intensity of the battle.