Fantasy fish with a sleek, transparent body and butterfly-like fins. The body has a crystalline skeleton visible through its glass-like structure, while the large, delicate fins resemble translucent butterfly wings with glowing patterns of emerald and opal hues. The fins are adorned with intricate starry details, and the fish's eyes sparkle like sapphire gemstones. Set against a solid black background, illuminated by ethereal light beams and subtle glowing particles. Magical, elegant, and ethereal.