A small, eerie glass vial containing swirling, luminescent blue liquid that seems to pulse with an otherworldly energy. The vial is sealed with a wax stopper, adorned with cryptic symbols etched in a dark, tarnished metal. The glass surface is slightly frosted, giving it an ancient, mystical appearance, with faint cracks and imperfections that hint at its age and the forbidden knowledge it holds. The liquid inside casts a soft glow, illuminating the intricate engravings on the vial's surface, which depict twisted, eldritch runes.