Durlag's Tower is breaking my brain (SPOILERS!)

Really unsure if this is the right place for this question, so please tell me if I'm out of line. But I'm having trouble in the under-levels of this tower and I'm just really not sure what I'm doing wrong.


I'm on the 3rd level down, I believe, and I only just figured out that I could attack the Sparring Dummies. Durlag's Doppelganger came and attacked. And I slew him. I slew him dead.


Now I'm at a loss. I attacked all three, and nothing happened. I've checked a few guides and found info on placing the rune stones in the Sparring Dummy's inventory, but that didn't seem to do anything. I've tried all three colors, in each dummy, actually. I've tried hitting them, talking to them, talking to myself, etc. I have access to what I *believe* to be the Throne Room (there's a red chair, looks kinda throne-y), but every FAQ I've checked says there should be some sort of crown in there?


There is not. I've hit TAB, but seen no hidden items. I've tried the stone gargoyles again, and nothing. I'd try standing on my head if it was an option.


If there are any adventurers on here with some sage advice to give out I'd love to hear it.


Thanks for any help you can give.