In a dimly lit cavern, a colossal mechanical dragon, crafted from shimmering steel and glowing gears, sprawls among piles of sparkling gemstones and ancient machinery. Its eyes pulse like molten lava, illuminating intricate engravings on its metallic scales. The air hums with the sound of whirring cogs, and steam billows from vents, creating an atmosphere of both wonder and danger, beckoning adventurers to explore its hidden depths.