I think the DK sentence => he's lying, but how to prove it => triggers Tax option.
Even Xepatar the guard guarding the practice room (where the demons are) talks about a Raanaar talking to imps. So, there may be several people pointing out to Dolehar. Or the trader Bexhanar => one tried to sell the book to him.

I didn't use these - but the ones I mentioned => according to the options I got, wrote down and followed. I loved this QA game <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />