The cover could prominently feature the archaic medallion mentioned in the story

The cover could prominently feature the archaic medallion mentioned in the story, with cryptic writing glowing faintly on its surface. The background could be a stormy night sky or a shadowy scene, suggesting the dark secrets and dangers surrounding it. The medallion could be partially hidden in the shadows, with just enough light to show its intricate design. Color Palette: Dark blues and grays with hints of metallic gold or silver for the medallion, creating an ominous and intriguing atmosphere.