One of a trio of brothers who discovered Wave Echo Cave.
Gundren was responsible for building a supply chain to the mine in order to get it up and running. He acquired funding via The Lords' Alliance, who dispatched Sildar Hallwinter to serve as Gundren's bodyguard.
He was kidnapped by the Cragmaw Tribe and taken to Cragmaw Castle as part of Nezznara Xorlarrin's plot to take over Wave Echo Cave. The Heroes of Phandalin rescued him, and he offered them a 10% share of the mine's profits in exchange for securing the mine.