Human: Make a concise location description of a dark scene inside of a medieval tower with a staircase and a vaalin lamp. Assistant: 
Gleaming bricks of smooth black onyx reflect the light from a wall-mounted vaalin lamp. No window disturbs the flame and the lamp's unwavering glow suffuses the air, which is noticeably heavy and still. A narrow staircase leads back down to the main hall, and enclosed corridors stretch off to the north and southeast.