Mystical Gateway of the Forgotten Realm

Prompt:  Ancient mystical archway with detailed carvings and statues perched atop a cliff amidst towering, rocky mountains, beneath a sky with a planet visible in the distance and a comet streaking through. A waterfall cascades from a river above through the center of the arch into a serene pool below, surrounded by lush vegetation and vibrant flowers. Stone pathways lead to the foreground, suggesting a hidden sanctuary of an advanced lost civilization.