Cabru, Primus, a celestial body of the terrestrial type, contained a repository of knowledge. It was in 21 years After the Battle of Yavin that Ochi of Bestoon, the Sith killer, attacked the archives, resulting in the death of a researcher. Following this violent act, Ochi appropriated the researcher's android, specifically the information and access unit D-O, claiming it as his own.
The first reference to Primus Cabru appeared in Shadow of the Sith, the 2022 book penned by Adam Christopher.