Four teens on a spelunking adventure stumble through a portal into a magical world of bronze skies and crystal spires. Trapped in this Babylonian realm, they must outwit a centaur-demon who craves their blood to escape his exile. A cryptic warning reveals their only hope: return home before a blazing comet seals the portal for 10,000 years. Racing against time, they climb jagged peaks, solve ancient riddles, and evade deadly traps, forging an unbreakable bond. But as the comet nears its zenith, the demon closes in—will they escape, or become his key to unleash chaos on Earth? A thrilling YA techno-fantasy adventure where courage and friendship face the ultimate test.