Imp: Free Zandalor after you're thrown out of the castle. NW in the Council Hall is a room with this imp.
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Goemoe: Did you inform Zandalor about his leave? If so, look into the scrying statue.

Dwarf Eolus is the 6th member you may recruit. Scrying statue then should show the Dwarven village/Rivertown

Dagger: Thieves guild/Ducal Inn/Verdistis. Look for Rob's room there, book on a table with what you need.
Kiya