The walls of an ossuary corridor, the walls stacked thick and high with bones so tangled they cannot be easily parted, hide a chimney-shaft connecting the tunnel with much deeper construction.
Deep below, a chime tolls out regularly, not quite on the hours but almost, as if counting the hours of another world’s day. This chime can be heard through the bone walls. When it does, fires and spell-lights hear it as an order to go dark.
The hall itself is singular, despite the dungeon complex being bifurcated into light and dark reflections. Which reflection one exits the hall into depends on whether one does so under bright light, or darkness (or the mere light of a single candle), as is the case in other shadow portals.
Behind one of the bone walls is a disused shrine, though the way to it would have to be cleared through an arduous work of desecration. The fae-shadow creature that once lived there, as much an artifice of glamer and shadow-working as it is a material thing, has long since abandoned that dwelling to take up another, allowing the bones of mortals to be used to wall off the old place. Perhaps, under a loose flagstone in the shrine, some ritual vessels still remain.
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Ten Leagues Beneath the Earth 