I don't know if you remember, but many years ago there were all sorts of rumours about a series of secret dungeons hidden in the spires and dragon towers, accompanied by many times that number of suggestions on how to enter them. Eventually, I spent a couple of days going through the files of this game with a hex editor, reading whatever in there was readable, and a good bit that wasn't. Not unexpectedly, I found no sign whatsoever of any secret dungeons or entrances to them, but what I did find was all sorts of other stuff left over from the time when the programmers were constructing the game. I never checked MM7 or MM8, but I'd be astonished if there weren't corresponding stuff left over in the files of those games. Certainly, the Druid Quest in MM8 was never completed.

Inquiring minds unquestionably want to know why, but you'd have to ask the programmers. Timbecile, are you listening?