OGRECAVES:

 lvl 0:

          O-D
          |
      D   O-O-O
      |   |
    O-O-O-O-O O
            | |
          O-O-O
   north   /
  emerald /
       | /
       |/
       O
       |
     telberin


 lvl -1:


            D
            |
            O
            |
            O
             \
              O-O+?
              |
              O
             /
          O-O     O
         /   \   /:
      O-O   U-O-O GG
      |
    O-U

 GG - Grunt's Guild



 lvl -2:


        O
        |
  O     O     O     O
   \   / \    |    /
    O-W   O   O-O-O
   /  |    \ /
  O   O     O         O
       \    |         +
    O   O   O     O O-O-L
     \  |    \    |   |
      O-O     O-O-O-O-O-O
     /   \   /    |   | |
    O     O-O     O-O O O
            |
            U

 W - Water Hole
 L - Thieves Library