The DoomFortress has more than 650 rooms and corridors (which of course I'm going to increase to 666). It has 10 levels spread over 11 maps. I plan to write out the contents of these rooms and levels.
The DoomFortress is attached to a mountain in some barren plains. It is not occupied by its original owners and is definitely no longer used as a official military post of any human force. There is lots of different factions in the DoomFortress, probably some are at war with each other. These factions are all relatively weird and deformed and I bet one of them is Albino Fishmen.
I have no idea who or what Tombin is or was, but I know Tombin not a particularly scary name for some one who owns a DoomFort.
From a distance the DoomFort probably looks like this:
Here are the maps, with a general vibe of what I think will be happening in each level:
Who wants to go there? I bet its got some treasure.