Nelvaanian males become warriors and scouts while the females were builders, gatherers, and raised the children. The tribes are governed by one shaman who claims spiritual rites within a clan, and one chieftain, elected through a series of religious tests and mutual admiration.
During the Clone Wars, Nelvaan was the location of a CIS base run by members of the Techno Union. General Grievous lured warriors from the Rokrul village by having them believe he was a prophesied figure out of Nelvaan mythology. Techno Union scientists then captured them, and physically and mentally altered them into cyborgs for the war.
Anakin Skywalker, who was referred to by the race as Holt Kazed (Ghost Hand in their language), freed them and destroyed the Separatist base. Although initially frightened by the appearance of their warriors, the females and children soon grew to accept them. Future generations of males retained the traits of their mutant progenitors, and as a result were larger than the females, who did not inherit the aforementioned characteristic.