A quote from many a book...
"Where the stench of brimstone is strong, fear, for great evil lurks there"

I currently don't have an active subscription, but this is something I'm throwing out from some complaints I've been seeing on the forums...

Think of lord of the rings, the mines of moria. On a mountains, I think there ought to be massive quarries/caves leading down to end-game loot (That was badly phrased, I couldnt think of anything else. Lets say the best loot yet)

Of course, as you go deeper and deeper, the caves get darker and creepier. At the lowest level, hidden creatures haunt everything, you may find a huge basket, but when you approach, a huge bear comes up behind you.

No, No, No. I am not suggesting instances. I'm just suggesting that mountains/earth be literally carved out and explorable.

Eh, Idea.
Please redirect hate mail to customer support.
Good day.