Where is the Portal Key on the first level? I was told it was in the master bedroom, but I can't find it anywhere. I have a wand of lightning key, but that doesn't get me through the portal. How do I get out of here?

I'm pretty sure it's in the mistress's bedroom - past the dryads just below the master bedroom.

Yes. Just go to the very south east corner in the garden and you will definately find the mistress bedroom, but beware. There are lots of traps waiting you in that room.