A dwarf is encountered during Death to the Dorgeshuun. The dwarf is a worker from Keldagrim, hired by Humans Against Monsters to help build a drill beneath the River Lum near Seth Groats's farm in north-east Lumbridge.
During the quest, players must wear full H.A.M. robes so that the dwarf will permit them to enter the Water Mill Cellar, where they fight Sigmund in an effort to destroy the drill that will ultimately flood Dorgesh-Kaan. The dwarf is unaware of H.A.M.'s exact plans for the drill, but ultimately doesn't care so long as he is paid.
Following the destruction of the drill and the quest's completion, the dwarf disappears.