Prompt: a breathtakingly ethereal fantasy concept art featuring the depths of an ancient gnarled tree, with its twisted branches reaching out to embrace a magnificent celestial enchanted fairy castle nestled amongst them, dim eerie light cast by the castle should illuminate both the corrupted tree and its dark surroundings, creating an ominous yet captivating atmosphere. Emphasize the painterly style of Andreas Rocha and H.P. Lovecraft to infuse this artwork with a sense of otherworldliness and mystery. Ensure that every element in this masterpiece is rendered with ultra-realistic high quality and highly detailed textures for maximum realism, making it perfect as cover art or simply an epic piece of fantasy art.