A powerful woman with very long, flowing red hair reminiscent of Amy Adams cradles a glowing, ethereal ball in her hands. Her presence is a blend between a fantasy lightning mage and a benevolent android necromancer. She wields a mystical pentagram shield that glows with ancient runes. Her expression is serene yet commanding, echoing the essence of the High Priestess tarot card. Her attire blends the elegance of a Celtic goddess with the divine aura of an anime deity. She stands amidst a stormy background, lightning crackling around her as if answering her call. This captivating scene would be a stunning feature on platforms like CGSociety or ArtStation, capturing the divine and mystical allure of a portrait of Celtic goddess Diana.