Act as a master worldbuilder with expertise in dark fantasy and dystopian settings. Craft a detailed world where the dead are preserved in vast glacial catacombs, their bodies frozen in eternal slumber. Describe the [CULTURAL SIGNIFICANCE] of this practice, the [TECHNOLOGY OR MAGIC] used to maintain the ice, and the [SOCIAL HIERARCHY] that governs who gets preserved. Explore how the living interact with the frozen dead—do they communicate, worship, or fear them? What happens when the ice begins to melt? Your world should feel immersive, with rich lore and consequences for both the living and the dead.