Reidoth might know

Qelline is a longtime friend of a druid named Reidoth. If you are looking for specific sites in the area, such as Cragmaw Castle or Wave Echo Cave, I suggest that you visit Reidoth and ask for his help, “since there’s not an inch of the land he doesn’t know.” She tells the characters that Reidoth recently set out for the ruins of a town called Thundertree, just west of the Neverwinter Wood. The ruins are about fifty miles northwest of Phandalin, and she provides directions so the characters can easily find the place.