The Axion was the capital city-starship of the Caeliar civilization located on the planet Erigol. Axion, like the other cities of the Caeliar, were designed with lofty towers made of what appeared to be glass and steel flanking moving walkways. Columns rose hundreds of meters above the city, decorated with intricate repeated designs and linked with tenuous filaments. The entire city was contained in a bowl-like shape, hovering above the surface of the planet.
In 2168, the Columbia approached Erigol, hoping to make repairs after a disastrous engagement with the Romulans. After beaming an away team down to the surface, they arrived at the edge of Axion, and were met by Inyx. Inyx explained there would be no aid for their vessel, and the away team would be the permanent guests of the Caeliar, and given housing in the city.
As the Columbia's MACO personnel in the away team rebelled against their forced imprisonment, the Great Work apparatus on Erigol destabilized simultaneously, due to a feedback pulse from an extragalactic source. The planet and star were thrown into chaos, and the cities attempted to escape from the surface of Erigol via subspace tunnels. However, only Axion and its fellow city Mantilis were able to escape destruction. Axion traveled to a point halfway between the core and rim of the Milky Way Galaxy to a time six hundred and fifty years in the past. Once through, the Caeliar set about to hide their presence and analyze their location, to determine if the travel was an error to be corrected, or the proper flow of time.