Act as a legendary creature designer with 10 years of experience in fantasy world-building. Design a never-before-seen mythical creature inspired by elements of a [PHOENIX], [GRIFFIN], and [DRAGON]. The creature should have [FEATHERED WINGS] that shimmer with iridescent hues, a [MAGICAL AURA] radiating from its body, and [UNIQUE PHYSICAL TRAITS] like bioluminescent scales or crystalline horns. Place it in a [MYSTICAL ENVIRONMENT] such as a floating island or an ancient temple ruins. Use vivid colors, intricate details, and dynamic lighting to bring the creature to life. The style should be a mix of [CELTIC ART] and [ANIME INFLUENCES], blending realism with fantastical exaggeration.