@DD, I can't help with the first question, but I just realised that the reason Edwin can't learn an id spell is because he is a conjurer, and the opposite school of magic is divination, so he is barred from learning magic of that group.
Spoiler
testingtest12
Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup. Spoiler
testingtest12
.......All those moments ... will be lost ... in time ... like tears in rain.
About Entar Sivershield's Estate... I had the same problem and my rep was much higher, so I don't think rep has anything to do with this. I think the guards will attack ANY intruder. Just send your thief, use stealth to get in, and a lot of speed to get out. It's a solution that won't win a beautycontest but it worked for me.
She says: Lou, it's the Beginning of a Great Adventure