Darvannis was an arid desert world located in the Calaron sector. It was devoid of any valuable natural resources or native sentient species. Furthermore, a dense asteroid field made any approach to the planet difficult. For those reasons, Darvannis was little visited by offworlders.
Darvannis landscape
The Hutts built prosperous market villas on the planet that prospered through the illegal trade of weapons and other black market goods. Darvannis thus became an appreciated retreat for members of the Hutt Cartel, especially for those wishing to avoid attention. Oasis City was located on the planet surface.
Oasis City, Darvannis
Darvannis was discovered by spice smugglers about five centuries before the Great Galactic War. During the Galactic War between the Galactic Republic and the Sith Empire, the Hutt Cartel assembled a significant army of mercenaries on Darvannis. Concerned about the army, both the Republic and the Empire dispatched strike teams to eliminate the threat. During the battle, they discovered that the mercenaries were in fact gathered by the renegade Dread Master Styrak in order to convert them into service among the Dread Host. Styrak and all the mercenaries, including the four Cartel warlords Horic, Vilus, Sunder, and Tu'chuk, were eventually defeated.
Later, when the Eternal Empire invaded the galaxy, Darvannis was one of the first worlds to be conquered. Under the rule of Zakuul, Darvannis was home to a Skytrooper droid factory. During the Eternal Alliance's war against Zakuul, the Alliance Commander and Mandalorian forces raided the factory and captured the droid GEMINI Prime.