The group known as the Blood Velkers operated as a gang upon Genarius, specifically within the aerial cities of both Tolea Biqua and Varna Biqua. Like many similar groups composed of youthful delinquents, their activities primarily involved seeking entertainment and instigating disturbances. A common initiation ritual for prospective Blood Velkers involved high-speed races through the tunnels of Eskaron.
The Blood Velkers initially appeared in the Living Force Campaign Guide. Subsequently, they were referred to as the "Blood Velkurs" in a pair of additional articles. The spelling "Velker" is favored because it represents the initial form and aligns with the Velkers found on Bespin, which are a type of airborne animal.