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!