Okay, this is embarrassing. I cannot find how far it is from the walkway to the floor in Vitriss Bale's chamber in Karran-Kural. Unless I've forgotten to read, it's not listed in the hardcover. I swear I found it once on the boards but now that I need it I can't find it again. Since the room is described as spherical, I was going to go with 40 ft to the bottom. Thoughts?
I preface this post with, "Yeah, 40 feet is good."
Dungeon Issue #109, pages 47 & 48, "The room has an almost spherical shape, excepting only its level floor." Based on the side view picture of the room on page 44, the bottom of the sphere has been cut off to make the floor level. Because of that, the walkway is closer to the bottom than it is to the top (which is 40 feet). So, the walkway appears to be only 30 feet from the bottom.