Kynes and Bren reach the bottom of the shaft. His staff throws pale light across walls that throb with a slow violet pulse, like flesh under skin.

The chamber is no stone vault. The floor bows in dark ridges, and the air tastes of ozone and wet earth. Ahead, a seam of brighter violet marks a deeper passage.

Bren tightens her grip on her blade, keeping close to Kynes while the chamber hums around them. The pulses answer the glass key and metal seal hidden on his person.

A narrow opening splits the far wall with a low grind, as if the living chamber is making room for them. Beyond it waits the next drop into the depths, and the thing beneath the watchtower draws them onward.

The violet light intensifies, bleeding from the very stone beneath Kynes's boots. The rhythmic thrumming is not merely a sound, but a heartbeat that synchronizes perfectly with the pulse of the glass key.

Kynes lowers his staff and lets the violet glow spill across the veins. Beneath the translucent tiles, the lines branch like roots and pulse in measured rings, not random at all. He traces a hidden lattice, and the pattern resolves into chambers, ducts, and a central hollow far below.

A second rhythm answers the first, faint but distinct. It comes from the new opening in the wall, where the same light throbs deeper and steadier, as if the passage is drawing breath.

The Warden’s voice seeps from the stone, calm and close. The pulse under Kynes's boots aligns with the key in his hand, and the glow sharpens at the edge of the breach.

The veins briefly show a second path, one that curves back upward through the tower, then vanish. The opening widens with a wet grind, inviting, while the chamber’s light dips like a heartbeat skipped.

Kynes rises from the floor with the staff in hand, turning toward the widening breach instead of the veins beneath his boots.

The violet pulse catches Kynes's shoulder as he steps through first, and the chamber behind him falls into a dim, breathing hush.

The passage narrows into living stone, slick with light, and then opens again around a deeper chamber below. The floor there hangs like a ribcage over a dark hollow, its veins beating in slow rings.