Hafner was a male Duros scientist who worked for the biotech company Kelen Biolabs during the Galactic Civil War. Sometime shortly after the Battle of Yavin, he traveled as part of a collection crew for the Biolabs to the moon Fex in the Deep Core Sha Qarot system to survey and find possible valuable biological samples. Once on the moon, he and two other members of the team disembarked from their starship the Harvester and began investigating Fex's wildlife. However, the trio were soon ambushed by the previously undiscovered apex predators of the moon, the Fexian skullborers, which quickly killed Hafner's two compatriots before Hafner could stun them. Calling the Harvester to pick them up, Hafner began to observe one of the skullborers after stunning it, recording valuable information with