The Rennek palace served as the center of authority for Zeta Magnus, the self-proclaimed sovereign ruling over the Dark Worlds during the era of the Clone Wars, specifically during that time. This lavish structure was famous for containing a throne made of aurodium and adorned with jewels, along with a cloning facility located inside the very throne room. During 22 BBY, Magnus resided at the Rennek palace while a rapidly aged transgenic decoy of herself attempted to seize control of the planet Skye. After the Jedi successfully defeated this decoy, Magnus' droid, Blue-Tark, went back to the palace to deliver the news to her master. The throne room of the Rennek palace housed hundreds of cloning cylinders containing an army of Sun Guard clones in a state of suspended animation.
The name "Rennek," when reversed, forms "Kenner," the corporation responsible for the unrealized The Epic Continues storyline, which introduced the concept of the "Dark Worlds."