ethereal fantasy concept art of  A magnificent, detailed illustration of a mythical fantasy landscape. The foreground features an ancient stone bridge over a serene river, surrounded by lush, enchanted forests. In the middle ground, a majestic castle stands tall with towers adorned with intricate designs. A dragon emerges from the castle's entrance, its scales shimmering in the sunlight. In the background, a colossal mythical beast, a combination of a griffin and a unicorn, soars across the sky, casting a beautiful yet terrifying shadow on the land. The overall atmosphere is captivating, with elements of both wonder and danger . magnificent, celestial, ethereal, painterly, epic, majestic, magical, fantasy art, cover art, dreamy