A jar filled with a swirling, iridescent blue fluid, thick and bubbling with a faint golden shimmer. Inside the jar, a small, floating metallic cube with intricate engravings pulses with a soft white light. Tiny sparks of energy crackle around the cube, illuminating the jar's interior. The jar itself is adorned with ancient symbols and has a faint, magical aura. Photorealistic, best quality, highly detailed