The Proving Grounds served as an ancient ceremonial location on the planet Onderon, dedicated to the veneration of combat.
Initially constructed by cultists connected to Freedon Nadd, this place became a venue for deadly contests. In these competitions, fighters battled until death, all to gain the approval of the Dark Lord. Subsequently, the Untamed took control of the site from the Sith, undeterred by the dark side of the Force's influence within the grounds. The Untamed repurposed it to conduct trials for aspiring Beast Riders seeking to become Beast-Lords. Because Untamed Beast-Lord Akoru failed to maintain the site, the planet's aristocratic families also made use of it as a holiday getaway. It was common for nobles to return from these getaways boasting of great achievements, though there was typically minimal proof to back up these claims.