I can't find the way down! Am I going blind? Can the stairs be behind a secret door? I don't have any mapping spells or clairvoyance stones. Level 7, seed KXK-ZML-VGR. The room at the bottom of the map is closed.
Update: backtracked to a store and sold some stuff to get a spell of magic mapping. There were two secret doors on the west room woth the two columns. This is the first time this happens!
From taking a quick look, it seems like floor 7 on that run is a secrets level type, which can have more hidden doors than usual. There's a large section of the level that you haven't discovered yet.