Trying to put a pic of the place in here ... let see. Fine!
Now, you came from the west and enter through the door on the bottom right of the room, which stands open. C and F mark the stairs up to the ledges with the sarcophagi, the necromancers and his companions stand right next to where F is on the map. D and E (south) simply mark the location of the sarcophagi in the southern wall, much like A and B mark those in the north. There's a well sort of thing in the middle of the room, depicting a dwarf in mourning of his fallen or dead comrades.
The necromancer is still talking to the other two chaps, both robed but more muscular than him. The shadow hovers nearby, while another person is trying to pry the eastern sarcophagus (to the right of F) open right now.