Astriums were circular objects created by the ancient civilization of the Zeffonians. One of the last remaining astriums was buried within the tomb of Kujet on the planet Dathomir. It served as the key to opening the Zeffo Vault on Bogano. In the Vault, Eno Cordova, a Jedi Master who studied the Zeffo civilization, hid a holocron containing a list of Force-sensitive children that could be used in order to restore the Jedi Order after the Great Jedi Purge.
- Star Wars: Timelines