Tower of Frozen Shadow

[Deathimself13]

Found this by accident whilst sat down looking through walls, it was another secret room that caught my attention first. After looking though all the walls on the first floor I saw this by the entrance. I've checked out the first 2 locs, for the first and second floor, and to me it looks like the locs for zoning in points. Can't find anything about this room online so thought I'd share here.