Gundrun was a dwarven business man in Neverwinter who owned the Lion’s Coster store in Phandalin. Gundrun hired us to escort a cart full of supplies to Phandalin. Gundrun needed these supplies delivered, so he could begin a mining operation near the vicinity of Phandalin.
On our way to Phandalin, we passed two dead horses on the road. There was a leather saddlebag with Gundrun’s initials on it. From questioning goblins and bugbears, we learned that Gundrun had been kidnapped by the Black Spider. We currently believe that Gundrun is being held in Craigmaw Keep.
There was a dwarven book in Glass Staff’s possession that talked about Wave Echo Cave. It’s possible that this book belonged to Gundrun.