Saturday Morning D&D
Gundren is one of the three Rockseeker Brothers (Tharden & Nundro are the others), Dwarves who have recently discovered Wave Echo Cave, the fabled entrance to the lost mine of Phandelver.
Gundren has hired the party to follow him and Sildar Hallwinter from Kole to Phaldelver with supplies. However he never made it to Phandelver. Him and Sildar were ambushed by Goblins who had been sent to capture them. Gundren was taken off to Cragmaw Castle while his map detailing the location of Wave Echo Cave was taken away.