Create a unique fantasy pet companion that resembles a small turtle with crystalline armor and serpentine features. Its shell is made of gleaming, semi-transparent crystals that reflect light in iridescent colors. The creature has a long, sinuous neck and tail, both covered in fine, glass-like scales. Its eyes are sharp and gleaming, and it can curl up into its shell to become an impenetrable crystal orb. When it moves, it leaves a trail of sparkling dust, and its slow but deliberate pace gives it a sense of ancient wisdom.