In the scorched wasteland of Aridia, water is a luxury hoarded by the tyrannical Sun-Priests of the Solarium. Zara, a resilient desert botanist, accidentally unearths a mythical artifact—the Heart-Seed, a relic from the old world capable of restoring the lost oceans. Hunted by the ruthless Solar Inquisition, Zara must team up with Corin, a cynical, mechanical-armed sand-skiff pilot, to cross the lethal Dune Sea and plant the seed at the center of the world before the desert consumes them all.