The planet had no native population, but following the Invasion of Naboo, Hypori was transformed into a foundry world for the Confederacy of Independent Systems. The planet was located near Geonosis, another world hosting Techno Uniondroid factories, and an entire hive of Geonosian workers was relocated to Hypori in a sponsored effort by Baktoid Armor Workshop to construct and maintain the new Separatist facilities. The tough bedrock and soil proved difficult to assimilate into a true and proper hive-mound, though the Geonosian workers eventually created huge underground factories. The existence of these droid factories was kept secret from the Galactic Republic during the lead-up to the Clone Wars.
In 37 BBY, During Darth Maul's training under the command of Darth Sidious, the Nightbrother spent a month in the planet without food or water and with a horde of assassin droids as company. After that, Sidious returned to fight against Maul, depriving him of his lightsaber. When Maul began filling his hatred for Sidious and tried to kill him, the human appraised him for passing the final test. Maul was given the title of Sith Lord,[3][4] secretly against Darth Plagueis' wishes.[2]
Shortly after the onset of the Clone Wars, Jedi MasterDaakman Barrek and his Padawan, Sha'a Gi, uncovered the Separatist operations on Hypori during an intelligence-gathering mission in the sector. They reported back to the Jedi High Council on Coruscant, which dispatched a Jedi and clone trooper strike team to investigate further.
The planet was abandoned until the Hutt Cartel learned of the existence of a droid factory that had survived the Clone Wars. They lured the Zann Consortium to the planet's surface, hoping that Tyber Zann's army would deactivate the hostile droideka Mark IIs, thus ensuring that Jabba the Hutt's forces could land and gain control of the planet—in the process killing Zann himself. However, the plan backfired, and cost Jabba greatly. The Consortium then used the technology on this planet to produce droideka Mark IIs. In the aftermath, Jabba and Zann agreed to a ceasefire.