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I don't know about every NPC but Darius has his own house in West Callaheim which is easily seen on the map and Gorak is in the Royal Palace in...
You should go to the help thread for questions like this
You just need to notice that the blue lightning thing is moving up and down and when it is moved up you can walk through, when it's down you can't.
You have to go along the coast from where Tierne is down to the Smuggler's Cove. Along the way you'll find a dead drake, loot it. Go back and talk...
I'm posting to let you know that I am very interested in the lists of possible side quests seeing as how I think I'm missing some