The chamber door sealed behind them with a sound too soft to trust—like a sigh trapped for years finally exhaled. Calyx felt it immediately: the air here wasn’t cold; it was compressed, dense with something that wanted shape but hadn’t decided which one. Sera tilted her head. “Hear that?” He almost said no—until the floor answered for him. A faint tink. Then another. Like glass tapping from underneath. They stepped forward slowly. The archive’s central aisle stretched ahead, vaults rising like ribs of a fossilized beast. But the sound wasn’t coming from the vaults—it was coming from the cracks between the floor tiles. Sera crouched, fingertips hovering just above the seam. “It’s not structural,” she whispered. “It’s rhythmic.” The tapping quickened—soft, frantic, deliberate. Cal

