Soon after the First Battle of Geonosis, Count Dooku desired that his most trusted General, a Dark Acolyte named Sev'rance Tann, help the Confederacy of Independent Systems to rebuild its droid armies.
Because of the great amount of resources—including ore, nova crystals, carbon and food—that the InterGalactic Banking Clan had left on their abandoned base, the Kaer Orbital Platform, Tann was sent there.
Sev'rance Tann landed in the platform with a small force of B2 super battle droids and one heavy hailfire droid, together with some power droids and Geonosian workers; as they began scouting they came across an abandoned command center; Tann decided to establish a base by sending a power droid to power the center and the workers established a troop center and used its forges to form B2 super battle droids and Anti-Air Super Battle Droids as more Geonosian workers were bred inside the command center; many mynocks tried to feed from the command center's power but were killed by Geonosian hunters as Tann scouted ahead coming across great numbers of supplies and reclaiming and powering two mech factories. Her mission was to create twenty DSD1 dwarf spider droids and 20 OG-9 homing spider droids. It sounded like a simple mission, but a Republic taskforce under the command of Jedi General Jor Drakas arrived at the platform and the mission quickly turned into a battle. However, Tann's forces were able to infiltrate the Republic base and destroyed their ships, making Jor Drakas contact reinforcements from a nearby fleet. Soon, Tann's new droid army was finished and Dooku sent Geonosian transports to ship the new forces to Tatooine and Raxus Prime before the Republic captured and reclaimed the orbital platform.
After they escaped the station, Tann sent the DSD1 dwarf spider droids, the OG-9 homing spider droids and the heavy hailfire droid along with the Geonosian army back to Raxus Prime to reserve them for the conquest of Sarapin and its defense. Meanwhile, Sev'rance along with the super battle droids and some droidekas set course to Tatooine in a mission to find the most powerful weapon of the Republic.