+x-------------x+
| \
| +----+
| |
| +----+----+--+--+
| | |
| S--+--+ + a + +
+ | |\ ^ | |
| +--+--S +<-+ b +--+--+ +
| | | v ^ |
| S--+--+ + + \->a +--+
| | |\| v |
| S--+ + + \ +
| | | b \
+ +--+ +--+--+ + 2
| | | \| Caverns
+--+--+--+ +--+--+--+ + Level 1
Mydgaard | \ |
Sewers 1 + +--+--+ |
Fourth \| \|
Floor + +
1 = Sewers of Mydgaard Fourth Floor {5-30}
2 = Dark Caverns - Level 1 {50-130}
Here is the universal key.