The Oblivion Spark was an Earth Alliance ship captained by Harcourt Ross near the end of the Cyberon War. (PROSE: Flight of the Cyberons)
Behind the scenes[]

The Oblivion Spark as seen in the trailer for BBV's Cyberon: Enhanced Spoken Word of the Novelisation.
A CGI visual of the Oblivion Spark was seen in the YouTube teaser trailer for BBV Productions' BBV's Cyberon: Enhanced Spoken Word of the Novelisation, an audio set which included an audiobook reading of Flight of the Cyberons.