JonII: I remember that editor. I think it's called W7EDIT.EXE or something like that. I'll see if I can find it online and post a link...or if you know where it is, post a link to it.
The place that you're thinking of is the "Temple of the Wanderer"; the 6th level in the Dane tower (same as the Magna Dane's room). Yes, I remember that corridor well. If you were lucky, you'd get about 5 groups of High Fathers or something like that, worth in the 80,000 XP point range...let fly with those Nuclear Blast spells!
There's another such spot in the Hall of the Past (much further in the game, near the Astral Dominae). It's a 4-way intersection, right in front of the huge square room with all the spinners. Every time you cross that point, you get a major encounter! I used that place to get my characters up to level 80. I was finally able to take out the Beast of 1000 Eyes after that (which was my goal in the first place; I'm averse to shameless "stat-mongering".)
-Sazerac