The Threefold Warden

You enter a circular stone chamber divided into three smaller rooms. The air smells of cold iron, river water, and old ash, though no fire or stream is visible. Bronze pedestals stand beneath faded murals, and blue light pulses through channels in the floor toward a sealed stone door. Three loose disks rest in a shallow tray, each marked with a flame, a wave, or a star. The door gives a low musical hum whenever someone approaches it, as if waiting for a particular order.