The Varkolak are a spacefaring species. Their territory includes the Gavaria sector. In 2255 of the alternate timeline, several Varkolak visited San Francisco to participate in an Interspecies Medical Summit. The Varkolak had a reputation among Humans for being monsters, with reports of their drinking of blood and for howling at moons. (ST - SA novel: The Assassination Game) "Varkolak" is Bulgarian for "werewolf".