Lower Karazhan

According to The Last Guardian, under the tower of Karazhan is an inverted version of the building. It begins at the ground floor, behind a hidden door, and works its way downward, with Medivh's secret chambers lying at the very bottom.

This reverse tower's layout is the same as the above-ground areas, but mirrored, with the layout of the top floor of the normal tower being the same as the layout of the bottom floor in this tower and so on. Its rough-hewn walls and floor were moist. Where an empty meeting room was within the tower, here was a dungeon bedecked with unoccupied iron chains. Where the Banquet Hall stood unused above the surface was a room strewn with detritus and marked with mystic circles that Medivh used to summon demons. At the level where the library should be was a dark kennel, and finally Medivh awaited where his observatory should have been.

• This area was never referred to again, even with the raid and dungeon versions of the tower. Return to Karazhan does show some upside-down rooms after the Curator is defeated, but the lower Karazhan described in The Last Guardian merely has its layout reversed. Khadgar, Garona and Lothar were not said to be walking on the ceiling of those rooms.
• Legion shows that there are extensive catacombs beneath Karazhan, but those do not mirror the tower's layout either. They could still, however, roughly match the layout of the RTS depictions of Karazhan.