Room 7/31 is dimly lit by magic that also suppresses the light of outside sources, like lanterns and torches, keeping the room in shadows. A giant's full-body mirror stands in an etched circle at the eastern end of the room. The etchings might have once held protective silver, but are now empty. The mirror itself is covered by a cloth that is all too easy to tug off.
Next to the mirror is a tall lectern. Attached to the lectern is a fine, but strong, chain that once connected to a book; the chain's snapped and the book long taken away by the Banshee. On the lectern is a large, silver bell.
If someone stands in-front of the uncovered mirror while the silver bell is rung, their mirror doppelganger steps out. Neither the original adventurer or the doppelganger produce reflections after this. The doppelganger is silent, at least initially. They are intelligent and their own person, who may or may not have the skills of the original. Mirror double is inclined to follow the group around.
If the bell is rung again while the mirrored adventurer or the doppelganger are in-front of it, the mirrored adventurer must make a saving throw vs. death. On a success, the doppelganger returns to the mirror and the adventurer casts a reflection in mirrors again. On a failure, the adventurer instead is trapped in the mirror, and the doppelganger casts a reflection now. It is possible the adventurer, so trapped, might be able to travel about the mirror world when not called in-front of a mirror by the doppelganger.
Welp. That's a helluva room to go out on for both this floor and the month. My only note for this room in my prep was "shadow creature." I didn't quite do that, but this feels like a spooky kind of magic that some of the old giants would experiment with.
Five months to go! This month was so much easier for me, writing-wise. I feel a lot better than when I was working through the Tree's floors.