Create a 3D model of a glowing crystal obelisk, standing tall in the center of a dark cave. The obelisk should be made of translucent, smooth crystal with an inner light radiating from within, casting vibrant colors on the surrounding cave walls. The crystal has intricate, ancient carvings glowing softly along its surface, and the base is surrounded by a faint mist. The shape should be sleek and geometric, with sharp angles. The environment should be minimal – just the obelisk as the focal point. Materials: glowing crystal, mist, dark stone. Style: fantasy, magical.