Aeon was the flagship of a Gallifreyan fleet of starbreaker ships during the early days of the Time Lords history. It was likely led by Lord Griffen and Lady Jodelex. The purpose of the fleet was the transformation of the star Qqaba into a black hole, according to a plan of Omega to achieve time travel for Gallifrey.
Fenris, member of the Order of the Black Sun, teleported onto the vessel and sabotaged its stasis field generator, to prevent the erection of stasis halos, necessary to the whole fleet, to avoid to be taken into the black hole. The intervention of Rassilon reverted the damage and prevented the disaster. (COMIC: Star Death)