He packed quickly. The site was a centuries-old quarry that local miners had started digging into the limestone, and somewhere beneath the lichen and dust was a cavern the size of a cathedral: Viridian Hollow. Legends called it cursed; a university called it significant. The Hollow had been mapped in bits—a pencil sketch from an 1892 mineralogist; a shaky sonar sweep from the 1970s; a drone flythrough that barely skimmed the high ceiling. None had captured the Hollow’s living architecture: the thin sheets of calcite that chimed when air moved, the microstreams that traced silver veins, the soft luminous fungi that pulsed when footsteps neared.

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