Been there, done that - about a thousand times? Then it is definitely time to switch sides and show that hero just who's who in the dungeon!
By "showing who's who in the dungeon" all it means is "you play the guy who builds dungeons."
The disconnect is that the guy who "builds dungeons" doesn't build them to
satisfy heroes he builds them to
protect his stuff and
kill intruders. Heroes are supposed to be the
side effect not the
goal.
I should know, I'm running
Dragon Mountain for my D&D group. I have all of the monster and NPC motivations at my fingertips. They didn't build their plane-shifting mountain to make heroes happy, oh god no. The built it to
keep heroes out and have done a mighty good job of it. The dragon who owns the mountain spent
hundreds of years researching magical theory before even acquiring the place; she's frikkin old. She doesn't let adventurers into her mountain so she can watch them run around having fun (before killing them for deliscious souls). NO! Her kobold minions take care of any intruders
for her, steal their stuff, and add it to her hoard as tribute.
In fact, when the party does finally reach Infyrana (assuming they do), she has been masquerading as their ally for a week or more, the dragon is in fact her high priest who she's punishing for
not taking care of the problem properly, and when she does reveal herself
she offers them an ultimatum: "Give me your stuff, or we can fight (and I'll win)."
I mean....seriously: