Etrenaks were powerful, cunning creatures, that were consumed by the Dark Side of the the Force. Etrenaks were particularly lethal because of the fact that they were both impervious to the Force, and could not be detected through the use of it. Their thick hide was also highly resistant to blaster fire. The Etrenak fed primarily on Jedi and Sith, and they were drawn with an insatiable hunger to Force-sensitives.