The Bolvek tribe was a tribe of Urgals (partly Kull) led by Nar Garzhvog. Like the rest of the Urgal race, they served Galbatorix, through Durza, at the start of the Rider War. After the spell was broken at the Battle of Farthen Dûr they wandered the land for months and later allied themselves with the Varden just before the Battle of The Burning Plains.
Roran came to command a number of members of this tribe in Brisingr. Yarbog challenged him for leadership, but Roran successfully defended against this challenge.