The Xel'Naga Phase Crystal is a high-detail, sci-fi artifact with a geometric, symmetrical structure, featuring a central core encased in angular, crystalline shards that emit a soft, luminous glow. The surface is smooth and polished, with intricate, engraved patterns that pulse with energy, suggesting advanced alien technology. The crystal's colors shift between vibrant blues and purples, giving it an iridescent, otherworldly appearance.