The tunnel swallowed us whole, its walls closing in like a throat, the crystal veins pulsing brighter with every step, their red-gold glow painting our shadows long and jagged across the slick stone. The air was thick, heavy with that burnt-iron tang, stinging my nose and coating my tongue, a taste that clung like ash after a fire. Liv's hand stayed locked in mine, her fingers cold and clammy, her sparks flickering like dying embers, barely enough to light the path. My pocket burned where the Hollow Core Fragment rested, its heat seeping through the fabric, syncing with the veins' rhythm—a steady thrum that rattled my ribs, deeper than my heartbeat, pulling me forward like a chain I couldn't break.