Astriums, crafted by the ancient Zeffonians civilization, were characterized by their circular shape. A surviving astrium was interred inside Kujet's tomb, found on the world of Dathomir. This particular astrium functioned as the means of accessing the Zeffo Vault, located on Bogano. Within this Vault, Eno Cordova, a Jedi Master with a deep interest in the Zeffo, concealed a holocron. The holocron contained information about Force-sensitive younglings, data intended to be employed to rebuild the Jedi Order following the devastation of the Great Jedi Purge.