Hi Billb52 I'm glad you're enjoying my mod
I'm away from my computer right now, but here are some answers which hopefully can help you:
1. Don't worry for the ornate key right now, it's in the Library.
2. To open the door to the Armoury, you need to find four items in the level below (Power Plant) which are related
The four pieces of the Warden armor set
3. Sorry for this one but I can't remember right now because I tried different locations for it when developing the mod, and I won't be back home until next week
Did you kill the wraith in the Power Plant?
4. The egg leads to a secondary secret. There is a book about dragons in the Library which gives you some clues.
You must put the egg between the dragon statues, then it's all about waiting for the statues to be in the right position, following the hints in the books, and set fire e.g. with a spell.
5. Are you speaking about the trapdoor just before a closed door? Try to open the door before closing the pit...
You already encountered a similar obstacle before. You must find a way to create a new scroll of opening (with magic note, bone, rock and wood). The magical paper is in one of the shelves of the first room and it seems you already found the altar where to use it.
I hope this will be helpful!