The Orkellian space slug, alternatively called the Orkellian cave slug, was a species of sightless slug that originated from the Orkellia system located in the Mid Rim region. Circa 1000 BBY, Bane, who had just declared himself the Dark Lord of the Sith, likened the lack of understanding displayed by his fellow Dark Lord, Skere Kaan, concerning the possibilities of the dark side of the Force, to the sightlessness of an Orkellian cave slug. One millennium afterward, the smuggler Han Solo made a comparison of the slug's same incapacity to the experience of waiting inside his starship, the Millennium Falcon, while the sensor array was being fixed.
The initial reference to the Orkellian cave slug occurred within the 2006 novel Darth Bane: Path of Destruction, penned by Drew Karpyshyn.