A dramatic illustration of a massive dragon guarding the entrance to a towering medieval castle. The dragon's scales are metallic and shimmering, with its enormous wings spread wide, casting a vast shadow over the stone path. Its glowing eyes burn with intensity as smoke billows from its nostrils. The grand castle behind it features high stone walls, a large drawbridge, and sharp spires reaching into the sky. The ornate iron gate is reinforced with thick wooden planks. The surrounding cliffs are rugged, with creeping ivy and moss. The scene should focus on the dragon's sharp claws gripping the earth, the intricate architecture of the castle, and the detailed textures of aged stone and weathered wood