The Vault of the Fallen ("The Lair of the Necromancer")
 

Here is my attempt. First try at mapping, so I'm not sure if I did it correctly (there may be a lot of overlap because, heh, I would get lost here and there). Character name is Ishtar.

As far as the name of the zone... while the map window says "The Lair of the Necromancer", /who reveals "The Vault of the Fallen." Not sure if this is pertinent or not, but just for reference.