A mystical landscape crafted entirely from glowing opal, shimmering with iridescent hues. The ground, trees, and structures are made of radiant opal, reflecting vibrant blues, purples, pinks, and greens. Each surface glows with a soft, ethereal light, casting shifting rainbows across the scene. In the distance, an opal castle rises from the land, its towers gleaming with multicolored opalescence, while the sky above is filled with glowing clouds that reflect the opal hues below. The atmosphere is dreamlike, with a gentle mist swirling around, amplifying the surreal, otherworldly beauty of this opal world.