The ship of the line class is a Bretonian unique warship, and is among some of the most feared sight the Sirius sector has ever known. The most massive vessel of Bretonian built, this ship is so heavily armoured it is reputed to be indestructible, and packs such a tremendous firepower (although most of its firepower are only available from its side canons), no capital vessel could ever outclass it.
The enormous cost of these ships have limited the number to only 3 known in active service within the imperial fleet, one of which is the flagship of Queen Carinna.